The Classic Vanishing Bikini Brief - Black
Smooth. Invisible. Leakproof. The everyday brief that disappears under clothes and quietly has you covered.
Find My Size
Where are you in your journey?
This shapes your sizing recommendation.
Which trimester are you in?
This helps us account for how much your body is still likely to change.
What is your current bra size?
Even if it doesn't fit quite right — we'll use this as our starting point.
Band CupLet's get you fitted properly
Get expert help by email
Bra fitting is part science, part feel — and when your body is changing (pregnancy, postpartum, post-nursing) it can be tricky to figure out alone. Send us a few details and one of our Fit Specialists will email you back with a personalised size recommendation. It's free, no pressure to buy.
How does the band fit?
Honest answers give us the most accurate size.
How does the cup fit?
No gaps, no spillage — you know what we mean.
Your recommended size
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Brief Features
Seamless
Leakproof
Matching set
Sustainable
stage guide
Smooth, confident, and effortlessly wearable, the Classic Bikini is your everyday essential. Redesigned for comfort and confidence, it features a bonded microfibre front with a vanishing, no-show finish and soft wide sides for a sleek silhouette. The mid-rise cut offers gentle support, while the soft lace back adds a touch of style and femininity. A discreet leakproof liner provides backup without extra bulk, making this bikini perfect for all-day wear. Designed to mix and match across the collection, the Classic Bikini is underwear that works as cleverly as you do — confidence to show up, comfort to stay all day.
Features: Smoothing bonded microfibre front with soft lace back and discreet leakproof confidence liner for a sleek, vanishing no-show finish
Style Fit: Mid-rise for a smooth, flattering silhouette that sits comfortably under clothing
Brief Style: Bikini | mid-coverage back with a seamless, comfortable design
Gusset: Lightweight leakproof liner for everyday protection and peace of mind
Sizes Available: 10 (S) – 18 (XXL)
Colour: Black
Features: Smoothing bonded microfibre front with soft lace back and discreet leakproof confidence liner for a sleek, vanishing no-show finish
Style Fit: Mid-rise for a smooth, flattering silhouette that sits comfortably under clothing
Brief Style: Bikini | mid-coverage back with a seamless, comfortable design
Gusset: Lightweight leakproof liner for everyday protection and peace of mind
Sizes Available: 10 (S) – 18 (XXL)
Colour: Black
Care Instructions: Rinse if required | Cold wash – love your lace and it’ll love you back
Fabric: Nylon, certified recycled nylon lace, elastane, polyester, PUL, cotton
Care Instructions: Rinse if required | Cold wash – love your lace and it’ll love you back
Fabric: Nylon, certified recycled nylon lace, elastane, polyester, PUL, cotton
Please note due to hygiene reasons knickers are unable to be returned or exchanged.
Free shipping applies to all orders throughout the UK over £50 with a 1-2 day processing time.
UK & EU Returns
Returns are complimentary with Checkout+ and are accepted within 30 days of delivery. You will have the option to either return for a refund or store credit.
Added Checkout+ at checkout? Your return label is on us, simply lodge your return and choose between a full refund to original payment method or store credit, free of charge.
No Checkout+? No problem, purchase your return label, then choose between a full refund or store credit with no additional fees or restocking charges.
Please note: the Checkout+ fee is non-refundable
Please see our dedicated Returns page for full details.
As a team of moms, we understand the importance of protecting the planet for future generations. We are committed to reducing our impact on the earth by creating beautiful products that are healthier for you, your family, and our environment. All Hotmilk garments are ethically sourced and go through rigorous testing to ensure the fabrics and hardware are safe and free from harmful chemicals.
Free shipping on orders over £50
Quick and easy 30-day returns
Worn, Loved & Shared
Common Questions on The Classic Bikini Brief
Everything you need to know about the leakproof liner, fit, and how it works
The built-in liner works in three steps — no pads or inserts needed:
- Stays dry against your skin — the inner layer wicks fluid away instantly so you never feel damp
- Locks it away — a soft cotton layer absorbs and holds fluid securely
- Nothing gets through — a built-in waterproof layer ensures nothing reaches your clothing
Designed for light everyday leaks — not for heavy flow.
Sizes 10 (S) through 16 (XL)
Fits true to size — choose your regular size
Between sizes? Size up for a more comfortable fit
Yes — the bonded microfibre front is seamlessly finished with no stitching lines or bulk. The wide sides and bonded edges mean nothing shows through under fitted clothing or tailoring.
For hygiene reasons, Briefs cannot be returned or exchanged. We recommend sizing true to size — if you're between sizes, size up.
