Newslettersubscribe

Personal Info

Delivery Methods

Returns

Contact Info

Women

New Arrivals

Spring Summer 2026 Womenswear

SPRING SUMMER 2026 

Silk Collection

Mulberry Silk

Spring Summer 2026 Menswear

 SPRING SUMMER 2026 

View All

ALL MENSWEAR

The womenswear team have designed a collection of elevated staples that underpin the daily wardrobe. Cut in a second-skin shape, this bodysuit is made from technical interlock jersey and features a scoop neck, deep back and bonded edges. Layer it with modular pieces.&nbsp;Slim fitPress-stud closureMachine wash&nbsp;Back length of size S is 39cm / Model wears a size S

The womenswear team have designed a collection of elevated staples that underpin the daily wardrobe. Cut in a second-skin shape, this bodysuit is made from technical interlock jersey and features a scoop neck, deep back and bonded edges. Layer it with modular pieces.&nbsp;<ul><li>Slim fit</li><li>Press-stud closure</li><li>Machine wash</li></ul>&nbsp;Back length of size S is 39cm / Model wears a size S

INTERLOCK JERSEY BODYSUIT

The womenswear team have designed a collection of elevated staples that underpin the daily wardrobe. Cut in a second-skin shape, this bodysuit is made from technical interlock jersey and features a scoop neck, deep back and bonded edges. Layer it with modular pieces.&nbsp;<ul><li>Slim fit</li><li>Press-stud closure</li><li>Machine wash</li></ul>&nbsp;Back length of size S is 39cm / Model wears a size S

The womenswear team have designed a collection of elevated staples that underpin the daily wardrobe. Cut in a second-skin shape, this bodysuit is made from technical jersey and features a scoop neck, deep back and bonded edges. Layer it with modular pieces.&nbsp;<ul><li>Slim fit</li><li>Press-stud closure</li><li>Machine wash</li></ul>&nbsp;Back length of size S is 39cm / Model wears a size S

This season's womenswear collection spotlights wardrobe cornerstones that channel a modern elegance. This long-sleeved top is made from luxuriously soft cotton-jersey that has a lightweight, fluid handle. The scooped neckline is trimmed in tonal satin for a refined finish.&nbsp;&nbsp;Slim fit160gsmMachine wash&nbsp;Back length of size S is 59.6cm / Model wears a size S

This season's womenswear collection spotlights wardrobe cornerstones that channel a modern elegance. This long-sleeved top is made from luxuriously soft cotton-jersey that has a lightweight, fluid handle. The scooped neckline is trimmed in tonal satin for a refined finish.&nbsp;&nbsp;<ul><li>Slim fit</li><li>160gsm</li><li>Machine wash</li></ul>&nbsp;Back length of size S is 59.6cm / Model wears a size S

SATIN-TRIMMED COTTON-JERSEY LONG-SLEEVED TOP

This season's womenswear collection spotlights wardrobe cornerstones that channel a modern elegance. This long-sleeved top is made from luxuriously soft cotton-jersey that has a lightweight, fluid handle. The scooped neckline is trimmed in tonal satin for a refined finish.&nbsp;&nbsp;<ul><li>Slim fit</li><li>160gsm</li><li>Machine wash</li></ul>&nbsp;Back length of size S is 59.6cm / Model wears a size S

Product Type

Product Feature

Colour

Material

Sizes

INTERLOCK JERSEY T-SHIRT

SLIM-FIT JERSEY CAMI TOP

TECHNICAL JERSEY LONG-SLEEVED TOP

SATIN-TRIMMED COTTON-JERSEY T-SHIRT

COTTON LONG-SLEEVED TOP

SEAMLESS MERINO WOOL T-SHIRT

CLEAN CUT LONG-SLEEVED T-SHIRT

SEAMLESS MERINO WOOL LONG-SLEEVED TOP

SEAMLESS MERINO WOOL MINI DRESS

COTTON-JERSEY LONG-SLEEVED TOP

SEAMLESS MERINO WOOL LEGGINGS

SLIM MERINO WOOL TOP

MERINO WOOL HIGH-NECK TOP

CASHMERE ROLL-NECK TOP

CREW-NECK MERINO WOOL TOP

Africa

Asia

Europe

Middle East

North & South America

Oceania

Country Selector Configs

Drawers

Global Config

Information Footer

Base layers

Thank you for signing up to the COS newsletter. We’ve just sent you a confirmation email – please check your inbox and click the link to confirm your subscription.

Confirm your subscription

We were not able to confirm your subscription. Please click below and we will resend a confirmation email.

Something went wrong

You are already a subscriber

We will keep you up to date on new collections, events and promotions.

Thank you, you are now subscribed

Sign up for 10% off your first order

YOUR SUBSCRIPTION IS UPDATED

It looks like you are based in {{currentCountry}} but are about to switch your shipping location to {{targetCountry}}. You will be signed out if you continue.

CONFIRM YOUR SHIPPING LOCATION

It looks like you are based in {{currentCountry}} but are about to switch your shipping location to {{targetCountry}}. Would you like to continue?

Modals

Notifications

Products Config

Sitewide

Introducing The Base Line: a system of base layers for daily life. Discover a curation of T-shirts, tank tops, camis and bodysuits, crafted with precision.

Underpinnings | Women's Base Layers | COS

Sign up to receive 10% off your first order and find out first about new collections, events and exclusive offers.

THE COS NEWSLETTER

About Us

https://career.cos.com/content/coscareer/en_gb.html

https://press.cos.com/connexion?lang=eng

Store Locator

Sustainability

Features

https://www.facebook.com/cos/

https://www.instagram.com/cosstores/

https://uk.pinterest.com/cos/

https://www.tiktok.com/@cos

https://open.spotify.com/playlist/03xISbDqJQ1DYgqtR9cjmN

THE COMPANY

Gift Card

Payment

Product Care

Size Guide

Fit Guide

Student Discount

ASSISTANCE

Privacy Notice

Terms And Conditions

Member Terms And Conditions

Terms Of Service

Cookie Notice

Accessibility Statement

LEGAL

No Reviews

There are currently no reviews for this product

Reviews Terms and Conditions 

Shopping Bag

Members receive free shipping with a minimum spend of {{currencySymbol}}50.

Please note, stock levels may vary. For further information, please contact the store.

Standard Home Delivery

Standard Pick Up Location

Standard Pick Up Locker

Express Home Delivery

MEMBERS RECEIVE FREE SHIPPING WITH A MINIMUM SPEND OF {{currencySymbol}}50

Favourites

You are currently shopping on {{currentCountry}} website. When changing countries your shopping bag will be emptied and you will be signed out of your account. Are you sure you want to proceed?

You are currently shopping on {{currentCountry}} website. When changing countries your shopping bag will be emptied. Are you sure you want to proceed?

Thank you for being with us, if you experience any problem with your subscription contact our support.

I would like to receive personalised promotions from COS a brand of the H&M Group. I confirm that I’m 16 years or older. I consent to let H&M Group process my personal data to provide me with personalised email and text messages in accordance with the 

Thank you, we have updated your subscription preference accordingly. Please note that it may take a day or two for the system to update and you may receive newsletters during this time that were already on their way to you. If you have any concerns, please get in touch by phone on 

By unsubscribing, we will no longer send you updates about new products, personal recommendations and sales to the email linked to this newsletter. 

You are now subscribed and we will keep you up to date on new collections, events and promotions.

Microsoft.Targeting

Turns on / off additional Material Information in PDP drawer

Enables automatic logout for authenticated users when changing countries to prevent cross-market session issues.

Azure Insights Telemetry for nextjs, both frontend and backend

Enables direct communication with the BFF for customer settings (get and update) instead of going through the legacy API proxy. Falls back to the legacy path when disabled.

Controls whether Canada (CA) market is included in hreflang meta tags for SEO.

Default: false (disabled)

Behavior:
Disabled (default): Canada is excluded from hreflang tags. Use this during the initial Canada launch phase when only a landing page is available and all other pages redirect.
Enabled: Canada is included in hreflang tags alongside other production markets. Enable this once Canada has full page coverage and no longer redirects users to a landing page.

Use case: Prevents search engines from indexing Canada-specific hreflang alternates until the market is fully launched with complete page support.

Turning this on will allow an Inactivity trigger (when user is returning) for an extra selection call to Centra

Enables the Ingrid delivery address locking functionality in checkout, which allows the delivery address section to be locked to prevent changes.

Bypass checkout/login and take user directly to CIAM page

Used to to display debug info from components using <Debugger> - Prod here is irrelevant as it can only be featureflag toggled for lowe environents

coming soon feature flag is to enable/disable the feature.

FeatureFlag that is determines ReviewsDrawer Version

Feature Flag to enable/disable reviews functionality in My Account application area.

worked together with clientDegubOverlay to display data around how long since last interactivity

Flag that enables Digital Order Return feature
- Link Button on My Account Order History
- Order Return Block on different pages

Controls if PDP delivery and returns sidebar shows Ingrid delivery estimation time widget or content from Storyblok.

Blocks plaintext email addresses in newsletter URL parameters (unsubscribe, double opt-in). When enabled, URLs must use hashed emails with bpId. Phone numbers remain allowed in plaintext.

Blocks plaintext emails in Double Opt-In confirmation URLs. Requires hashed emails with bpId. Phone numbers remain allowed in plaintext. Enable only after Emarsys includes bpId in DOI emails.

Disable preorder on lower environments. Preorder cannot be disabled on PROD.

testflag to show debugger in action provided clientDebugOverlay flag also is avalilable. Will never work in Production (only limited to lower Environments)

Switches on/off ecomID SizeFinder and SizeAlert widgets functionality on PDP

[Deprecated] Flag that will enable the use of the new elevated components as part of the Elevation project.

Used to enable/disable the option for overriding the navbars sticky behaviour in page settings.

Flag that will enable the use of the new elevated footer as part of the Elevation project.

Flag that will enable the use of the new elevated navigation as part of the Elevation project.

FF for elevated size select buttons/selector

Controls display of elevated quickshop drawer

Enables browser-based API mocking using MSW (Mock Service Worker) for local development, testing, and preview environments. When active, network requests are intercepted and served with mock data, improving frontend development speed and reliability. Disable in production.

Enabled PDP stock check call caching. Cache control headers will be set to 1 min.

Enables the new Wishlist API service as the storage backend. When this flag is true, the app persists and reads wishlists via the backend service.  When false, it uses the client-side cookie storage.

Switches My Account orders/returns data source from Centra GraphQL to ESCI API Gateway. Both paths produce the same unified types. 

When enabled it doubles PDP revalidation and caching time (will be set to 20 mins)

When enabled it doubles PLP revalidation and caching time (will be set to 20 mins)

This feature flag can be used to toggle support for faceted navigation on PLPs.

feature flag that is deciding which version of find in store drawer 

Allow COS App to use FHR AB Test caching instead of directly passing sessionID.

Controls whether Klarna payment options are displayed as separate, selectable payment categories or as a single consolidated payment method.

As we deprecate Headless UI , radiobuttons are first up to switch to Radix. Turn off on this feature flag if we want to fallback to Headless UI as fallback

Purpose: Enables historical price display for products to meet regulatory compliance requirements. 
What it does: When enabled, shows the previous price alongside the current price for applicable products, allowing customers to see price changes over time. 
Why it exists: Satisfies consumer protection regulations requiring transparent pricing history, helping customers make informed purchasing decisions and compare price trends.

When enabled, uses the ParcelLab test country code (xt) instead of the actual user country code for the Digital Returns widget.

https://hmgroup.atlassian.net/browse/PBCDE-12822

https://hmgroup.atlassian.net/browse/PBCDE-9156

Purpose: Enables unit pricing display for multipack products to meet regulatory compliance requirements.
What it does: When enabled, displays the calculated price per individual item for multipack products (e.g., "£5 / piece" for a £10 two-pack).
Why it exists: Satisfies consumer protection regulations requiring transparent unit pricing to help customers compare products sold in different quantities.

Our new Product Details Drawer using tabs 

Will trigger extra attention around size-guide, a red-text-button that animates, and notification messages in Wishlist and in the opend size-guide drawers

Validates checkout state integrity during payment processing by comparing server-calculated hash with client-provided hash, preventing payment when checkout data has changed between user confirmation and payment API call to ensure accurate orders.

If enabled, the Storyblok Cache service endpoint will be used to proxy Storyblok requests. Note: Not all envs have the endpoint configured so may not affect them.

Flag to enable test countries.
As of today (2024-07-19) these are:
BE, CY, GR, HR, LU, PT

Flag to enable test markets. 
As of today (2024-07-12) these are: 
CH, ES, FR, GB, IE, IT, NO, PL, SE

This flag is for new turbo cookie compliance

Use Upper Case (instead of lower / sentence case) in the product Card Titles

THE BASE LINE

Interlock jersey t-shirt

Interlock jersey bodysuit

Interlock jersey t-shirt

Slim-fit jersey cami top

Technical jersey long-sleeved top

Satin-trimmed cotton-jersey long-sleeved top

EXPLORE MORE BASE LAYERS

Satin-trimmed cotton-jersey long-sleeved top

Satin-trimmed cotton-jersey t-shirt

Satin-trimmed cotton-jersey t-shirt

Cotton long-sleeved top

Cotton long-sleeved top

Cotton long-sleeved top

Seamless merino wool t-shirt

Clean cut long-sleeved t-shirt

Seamless merino wool long-sleeved top

Seamless merino wool t-shirt

Seamless merino wool mini dress

Seamless merino wool long-sleeved top

Cotton-jersey long-sleeved top

Cotton-jersey long-sleeved top

Cotton-jersey long-sleeved top

Seamless merino wool leggings

Seamless merino wool t-shirt

Slim merino wool top

Cotton long-sleeved top

Slim merino wool top

Slim-fit jersey cami top

Slim merino wool top

Merino wool high-neck top

Cashmere roll-neck top

Merino wool high-neck top

Crew-neck merino wool top