Personal Info

Delivery Methods

Returns

Contact Info

Gift Card

Women

New Arrivals

Offer

30% OFF SELECTED PIECES

Knitwear

KNITWEAR

View All

ALL MENSWEAR

Product Type

Product Feature

Colour

Sizes

CONTRAST-TRIMMED TIE-SIDE BIKINI BRIEFS

WHITE / RED

BROWN / TERRACOTTA

TERRACOTTA / WHITE

CLASSIC BIKINI BRIEFS

NAVY

DARK BROWN

CONTRAST-TRIMMED BIKINI BRIEFS

RED / NAVY

BRAZILIAN BIKINI BRIEFS

WHITE

KHAKI

BONDED-SCUBA HIGH-WAISTED BIKINI BRIEFS

DARK RED

SHORT BIKINI BRIEFS

TEXTURED HIGH-WAISTED BIKINI BRIEFS

BROWN

RUST

COLOUR-BLOCK SCUBA HIGH-WAISTED BIKINI BRIEFS

BLACK / CREAM

Category Page

Africa

Asia

Europe

Middle East

North & South America

Oceania

Country Selector Configs

Drawers

Global Config

Information Footer

Bikinis

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

We couldn’t find any products for this category. Please try again with another category.

We’re making some improvements to the experience and adding the latest new arrivals. Please come back soon.

We didn't find anything based on your filters. Please revise your filters again

We couldn’t find any results that match your filters. Please reset or adjust them and try again.

We are making some improvements to the experience and adding the latest new arrivals. Please come back soon.

It appears you are offline. Please check the connection and try again.

It appears you are offline. Please check the connection and restart the COS app or try again later.

Shop the look

Sitewide

Designed for summer days spent by the water, explore our collection of bikinis. From printed finishes to structured designs - find your perfect style at COS.

Women's Bikinis | COS

Sign up to receive 10% off your first order and stay up to date on new collections, events and exclusive offers.

Newslettersubscribe

THE COS NEWSLETTER

About Us

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

https://press.cos.com/content/cospress/en/home.html

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

Return My Order

Payment

Product Care

Size Guide

Fit Guide

Student Discount

ASSISTANCE

Terms And Conditions

Privacy Notice

Your Guarantee Rights

Member Terms And Conditions

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

MEMBERS RECEIVE FREE SHIPPING WITH A MINIMUM SPEND OF 900 {{currencySymbol}}.

We hope that you are satisfied with everything you order from us. If something is not right, you have 30 days to return the items to us. 

We will refund the purchase price via the payment method you selected within 14 days after we receive your return. We kindly ask that the items be returned clean, unworn, and with all labels attached. 

Please note that items purchased online cannot be returned or exchanged in our stores. 

Please refer to our [returns page](/en-au/customer-service/returns/) for more information.


Any questions? Please read our [frequently asked questions](/en-au/customer-service/faq/).


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?

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

When enabled, it monkey-patches the Adyen SDK's Drop-in component to intercept payment method selections and reads it back on the checkout success page to show the human-readable payment method name.

Temp FF for adyen CSS update to v 6.17 where styling is changed. Off show old On show new CSS

AGEC Law compliance-related features, such as more detailed information in PDPs

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

Azure Insights Telemetry for nextjs, both frontend and backend

Use new INCI attribute (array-based format for ingredient display)

Feature flag for BFF Apple wallet endpoint

Gates the newsletter BFF migration. ON routes subscriber and subscription read/write operations through the Customer Account BFF; OFF keeps the legacy My Account/newsletter API path.

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.

on product listing pages such as the ones using storyblok-categorypage template, toggle between using Fredhopper as productlist-provider or the BFF search endpoint. This is once one servers-side but also for CSR

This is for BFF coming soon notify me subscription service.

This feature flag to consume find in store api 

Responsible for changing source of ProductDetailsPage product data.
ON - requests towarads bff product-details

BFF Search integration with new search overlay

Flag to enable BFF integration in Search area - get search suggestions.

Enables the BFF-based order returns flow in place of the legacy returns implementation

Enables the BFF-backed store receipts flow, switching store receipt list and detail requests from the legacy account API to the customer orders BFF.

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.

When enabled, the checkout payment flow will attempt to update an existing guest customer (PUT) if guest creation returns a 409 conflict, instead of failing. This enables an upsert pattern: create if new, update if already exists. 

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.

Manage pricing colors across all listed pages, keeping the default behavior when the feature flag is OFF and applying the new pricing colors when it is ON.

PDP
Quick Shop Flyout
Shopping Bag
Product Cards
PLP
PRAs
Wishlist
Search
Checkout
Order Confirmation Page
Order History

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.

enables discount percentage display site wide

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.

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.

Enhanced PDP Schema.org ProductGroup JSON-LD structured data

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

Controls the staged rollout of delivery-group shipping mutations in Express Checkout.

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.

Enables adding the membership card to Google Wallet on Android devices.

Schema.org ItemList structured data on category product listing pages

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

used to support showing more swatches than just 1 at a time

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.

Enables tracking the origin of newsletter subscriptions by attaching touchpoint metadata to Customer API, identity provider, and Tealium payloads.

Tealium: include guest_bpid in purchase event for guest checkout

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

Bikinis Women's bikini briefs |

Contrast-trimmed tie-side bikini briefs

Contrast-trimmed tie-side bikini briefs

Classic bikini briefs

Contrast-trimmed bikini briefs

Brazilian bikini briefs

Bonded-scuba high-waisted bikini briefs

Short bikini briefs

Bonded-scuba high-waisted bikini briefs

Textured high-waisted bikini briefs

Textured high-waisted bikini briefs

Colour-block scuba high-waisted bikini briefs

Brazilian bikini briefs

Classic bikini briefs

Contrast-trimmed tie-side bikini briefs

Contrast-trimmed bikini briefs