Designed exclusively for DD+ cup sizes, our Signature Full Cup Bikini Top delivers full coverage, maximum support, and effortlessly elegant style.

Clean lines and gently ruched cups create a flattering silhouette that enhances and supports the fuller bust. Crafted in bold block colorways and finished with luxe golden metal clasps and trims, it’s the ultimate blend of function and sophistication.

Engineered with our revolutionary Signature Support Lining, this top offers invisible structure and stability—so you feel confident, secure, and beautifully supported, even when wet. 

Features:

• Bra Sized for perfect fit and coverage
• Underwired for superior support
• Fully lined with our Signature lining for invisible structure, stability and support 
• Non-padded for no unnecessary bulk
• Wide adjustable shoulder straps for comfort and perfect lift
• Luxury Italian Eco-friendly recycled swim fabrics

Core Lining: The Secret to Unrivalled Support

Our signature Core Lining is what sets us apart—an ultra-thin, quick-drying fabric which stabilises swimwear fabric to deliver discreet, powerful support for fuller busts.

It creates an invisible internal structure that lifts, shapes, and secures—without adding bulk or compromising on style. Even when wet, the support never fades, giving you total confidence, all day long.

Premium Italian Eco Friendly Bikini Fabric:

• Bikini outer fabric is 78% Recycled Nylon and 22% Elastane
• Recycled nylon produces up to 80% less greenhouse gas than material produced from oil and reduces landfill and ocean waste
• Excellent UV protection
• Ultra Chlorine, Sun Cream and Oil Resistant
• Fast drying, super soft with superior shape retention
• Handwash only with cool water and mild detergent

Sizing:

The bikini top has been designed for maximum support to give you confidence that you can trust it will stay put and do what you need it to do. The key to this is that you get the perfect size so please see our fitting guide or contact us for help and assistance.

The key to your bikini doing what it has been designed to do is the fit. If it doesn't fit you properly, it won't support you properly.

The Core Bikini Top:

1. Back size:

The Core bikini top has been designed to be as close as possible to your bra size so you should order your standard back bra size (e.g. 36). Please note that the Core bikini has been designed to fit snuggly on your back size. We do not mean tight (that would be uncomfortable) but we do mean snug. The reason for this is:

1. A lot of the support from the bikini (and your every day bra) comes from the back. If the back is too big, you will lose support

2. Although the Core Swim bikini is fully lined (including the wings) to minimise stretch and maximise support when wet, we want you to be just as confident in your wet bikini as your dry bikini so we've designed it snug (again not tight!) so there is no need for those public adjustments when you get out of the pool.

Advice: If your bikini arrives and the back is not snug, consider a smaller size as you may get a better support. If it is too tight, please consider the next size up.

Note that if you size your back size up or down, you will also need to change your cup size to reflect this (it's called "sister sizing", see below).

2. Bikini cup size:

This is a sister sizing bra size chart. It is quite simple, if you wear a 36FF and the back is too tight, you would go up a back size and down a cup size to a 38F. Or, if the 36FF was too big, you would go down a back size and up a cup size to a 34G (see black arrows):

If the back fits you perfectly but the cup feels big then just go down a cup size to a 36F. Or, if the cup is not covering you as much as you would like or there is bulging, then go up a cup size to a 36G (see the red arrows).

Core Swim Mid Rise Bikini Bottoms:

Our bottoms are designed to fit on the mid-rise. As an estimate, we would say this is half way between your hips and your waist. 

The below table shows the size to order and the range of fit in cm of the circumference of your "mid-rise":

If you would like any further help, please contact us and we will be happy to help.

 International Size Conversions:

Delivery Charges to UK

• We use Royal Mail Tracked delivery service which will usually arrive within 2-3 business days from date of dispatch
• Delivery fee is £3.95 for mainland UK
• We do not currently offer next day delivery service
• We aim to dispatch orders within 3 working days

Returns Policy

• We want you to be completely happy with your Core Swim purchase but if you want to return it for any reason, then you can return it within 14 days of the date of delivery for a full refund (excluding any delivery charges)
• To start a return please sign into your account or follow this link Click here to start a return
• You must notify us of your intention to return within 14 days of receiving the item
• Once your return request has been confirmed, you have 14 days to return the item to us
• Returned items must be unused and unworn with hygiene stickers and security swing tags intact on the garments. Items we cannot resell due to damage whilst in your possession will not be refunded. Please return them in the same condition you would expect to receive them (be mindful of make-up, deodorant etc)
• The cost of return is at your own expense and will not be refunded unless the item is faulty
• Please retain a proof of postage with reference as we will be unable to issue a refund for goods that do not arrive back to us
• Once we receive your return we will issue a refund via the original payment method
• Your refund will be processed within 5 working days
• We do not currently offer exchanges as standard due to high stock turnover and availability of stock but please contact us if you would like to exchange and we will check stock and process manually if items are available
• Click here to start a return

Exchanges

• If you would like to return any items for an exchange then please email us at sales@coreswim.co.uk or click reply on your order confirmation email
• Please quote your order number, details of the items you are returning and details of the items you wish to exchange them for
• We will check stock and confirm availability via email
• You must notify us of your intention to return/exchange within 14 days of receiving your order (as per the above returns policy)
• We must receive the returned items within 14 days of us confirming the exchange
• The cost of return is at your own expense. Please retain a proof of postage with reference as we will be unable to issue a refund or exchange for goods that do not arrive back to us
• Once received we will processs the exchange. If the cost of your exchanged items is less than your original items then we will refund the difference via your original payment method
• We offer FREE DELIVERY on exchanges (one per order)
• This exchange policy only does not apply to items on sale

Faulty Products

• Our products have been made by highly skilled seamstresses using only high quality materials and they have been put through rigorous quality control procedures
• We expect them to arrive with you in perfect condition and if cared for according to our care advice, to last you a long time.
• In the event that your product arrives faulty please contact us to arrange a return and refund
• In the event that your product develops a manufacturing fault after use, please contact us to discuss and to arrange a return. Please note that normal wear and tear is not considered a fault and we would expect that the garments had been cared for according to the care label instructions