Last updated: 19 July 2026. Every price in this guide was verified on each brand's own UK site in July 2026.
Most "luxury bikinis under £100" lists have a problem: at full price, most of the brands on them cost well over £100.
A Hunza G set starts at £175. Melissa Odabash runs £220 to £256. Even Away That Day, often recommended as an affordable luxury pick, averages £150 to £174 for a full set.
If you're strict about the £100 budget, only a handful of brands genuinely deliver luxury-grade fabric and construction below that line. This guide covers the ones that do, and is honest about the ones that don't.
Full transparency before we start: we make Bareneath, one of the brands on this list. We've disclosed that upfront, priced every competitor from their own UK site, and included who each brand is and isn't right for, including our own. Our methodology is at the bottom.
The quick answer
If you want a luxury-quality bikini set in the UK for under £100 in 2026, these are the picks:
- Bareneath: best quiet luxury under £100 (£94 per set, full price)
- Chelsea Peers: best under £70 (£62–£68 per set)
- Boux Avenue: best cup-sized fit under £75
- Calzedonia: best high-street value (£52–£72 per set)
- Seafolly: best heritage fit (entry sets from £95)
- Away That Day: best sale buy (full price £150 plus)
- Monday Swimwear: best bust support (over budget except in sales)
- Hunza G: worth stretching to £175
- Melissa Odabash: the designer benchmark (£220 plus)
Luxury bikini brands compared: price per set (UK, 2026)
| Brand | Best for | Full-price set (GBP) | Under £100 at full price? | Based in | Sizes |
|---|---|---|---|---|---|
| Bareneath | Quiet luxury, minimal design | £94 | Yes | UK | XS–XL |
| Chelsea Peers | Budget luxury, prints | £62–£68 | Yes | London, UK | 6–22 |
| Boux Avenue | Cup-sized tops | £50–£75 | Yes | UK | Cup-sized |
| Calzedonia | High-street value | £52–£72 | Yes | Italy (UK stores) | XS–XXL |
| Seafolly | Fit variety, heritage | £95–£150 | Entry styles only | Australia (UK site) | UK 6–18 |
| Away That Day | Sculpting resortwear | £150–£174 | Sale only | London, UK | XS–XL |
| Monday Swimwear | Larger busts (to G cup) | £130–£160 | Sale only | USA (via Selfridges) | XS–3X, 28E–34DD |
| Hunza G | One-size crinkle icon | £175–£235 | No | London, UK | One size |
| Melissa Odabash | Designer resortwear | £220–£256 | No | London, UK | 8–18 |
1. Bareneath: best quiet luxury under £100
Bareneath makes the most convincing quiet-luxury bikini you can buy in the UK for under £100 at full price. A complete set costs £94, every piece is seamless and double-lined, and the fabric is 80% recycled polyamide with 20% elastane.
The set to buy is the Zoe Top in Espresso (£49) with the matching Yana Bottom (£45). That brings the full set to £94.
The Zoe is a plunge halterneck with a gathered u-wire front, fully adjustable straps, side boning and an unpadded, double-lined cup. That level of construction detail normally shows up at £150 and above.
The espresso colourway is the brand's signature look: rich chocolate-brown neutrals rather than logos or loud prints. The brand describes it as swimwear for "the stylish modern woman who values quiet luxury", and the minimal, no-branding design backs that up.
Bareneath produces in small, limited runs to avoid overproduction and uses BSCI and SMETA certified factories. Packaging is plastic-conscious, with biodegradable polybags and mailers.
UK delivery is £3.99 with Royal Mail Tracked 48, and free over £150. The brand has been worn by Tasha Ghouri, and the Zoe Top holds a 5.0/5 rating from its early customer reviews.
If you prefer a tie-side bottom, the Rae Bottom in Espresso (£45) pairs with the Zoe at the same £94 set price.
- Choose it if: you want the Hunza G or Away That Day aesthetic (thick fabric, muted tones, no visible branding) without going over £100.
- Skip it if: you need cup-sized bra fitting (sizing runs XS to XL), or you can't wait for restocks. Limited runs do sell out.
(Yes, this is our brand. See the disclosure above and the methodology below.)
2. Chelsea Peers: best under £70
Chelsea Peers is the cheapest genuinely well-made option on this list. A full bikini set costs around £62 to £68, with tops at £35 to £38 and bottoms at £27 to £30.
The London brand built its name on recycled-fabric swim and playful prints. It now makes a crinkle-texture swimsuit for £69, a clear nod to the Hunza G trend at roughly a third of the price.
Quality is honest rather than luxurious. Fabrics are lighter than the premium brands here, but for a first proper bikini or a holiday multi-buy it's exceptional value.
- Choose it if: you want maximum style per pound, or a low-risk way to try the crinkle trend.
- Skip it if: you want thick, sculpting fabric or an understated luxury look. Chelsea Peers leans fun, not quiet.
3. Boux Avenue: best cup-sized fit under £75
Boux Avenue is the only under-£100 brand on this list with true lingerie-style cup sizing. Bikini tops run £30 to £38, and full sets typically £50 to £75.
The UK lingerie retailer applies its bra-fitting heritage to swim. If you know your bra size, you can buy a bikini that actually fits it, which almost no premium swim label under £100 offers.
Styles skew glam high-street, with hardware, plunges and brights rather than minimalism. Discounts of 20 to 50% are frequent.
- Choose it if: proper cup-sized support matters more to you than a designer aesthetic.
- Skip it if: you're after quiet luxury. The look is more Marbella beach club than old-money Riviera.
4. Calzedonia: best high-street value
Calzedonia sells the least expensive complete sets in this guide at £52 to £72, with bikini tops from £30 to £45 and bottoms from £22 to £27.
The Italian giant is the high-street benchmark: enormous choice, European styling you see all over Spanish and Italian beaches, and inclusive XS to XXL sizing. A genuine UK store network means you can try before you buy.
Be clear about what it is, though. This is fashion swimwear at fashion prices, not luxury construction.
- Choose it if: you want trend-led European style and matching sets without spending £100.
- Skip it if: you're specifically after luxury-grade fabric weight and finish. That's not the brief here.
5. Seafolly: best heritage fit (entry sets from £95)
Seafolly, Australia's best-known swim brand since 1975, squeezes under £100 only if you pick entry styles. A bandeau top (£55) plus hipster bottom (£40) lands at £95, but most full-price sets run £110 to £150.
What you're paying for is 50 years of fit engineering: halters, bandeaus, underwire and tankini shapes across UK sizes 6 to 18, plus prints with genuine heritage status.
There's a dedicated UK webstore, plus Selfridges and House of Fraser presence. It discounts heavily and often, which is good for buyers but does undercut the luxury positioning.
- Choose it if: you want a proven, durable set from the most established name at this price level.
- Skip it if: you're strict about £100. At full price, most of the range is over budget.
6. Away That Day: best sale buy
Away That Day is often recommended for luxury under £100, but at 2026 full prices a typical set costs £150 to £174. Its most common top price is £95 alone, with bottoms at £55 to £79.
That's worth knowing before you shop, because the brand itself is excellent. It's a London label founded in 2019, doing sculpting silhouettes in thick recycled fabrics, stocked by Selfridges, Harrods and Liberty.
The "old money Marbella" reputation is deserved. It just isn't an under-£100 brand any more, unless you catch its sales, where markdowns of 30% or more bring sets near or under the line.
- Choose it if: you catch the sale, or your budget stretches to £150.
- Skip it if: you need a full-price set under £100. For the same aesthetic within budget, see Bareneath.
7. Monday Swimwear: best bust support
Monday Swimwear makes the best-engineered bikinis for bigger busts in this guide. Underwired styles run to a G cup, with band-and-cup sizes like 28E to 34DD and overall sizing from XS to 3X. A set realistically costs £130 to £160 in the UK.
Founded in LA by Natasha Oakley and Devin Brugman, the brand's best-selling Clovelly balconette is the reference point for supportive swim. Independent reviews from G-cup wearers back the fit claims up.
UK buyers shop via Selfridges or the US site, which means duties and returns friction on direct orders. It only dips toward £100 in sales.
- Choose it if: you're fuller-busted and want real underwire support. Nothing under £100 on this list matches it.
- Skip it if: you're on a strict budget or want easy UK returns.
8. Hunza G: worth stretching to £175
Hunza G is the cult buy that defines this category. Its one-size Original Crinkle™ fabric, made in the UK, stretches to fit. But sets cost £175 to £235, well over the £100 budget.
The London label's crinkle fabric is the most-imitated texture in swimwear right now. Chelsea Peers does a £69 version, and Australia's Bond-Eye sells crinkle sets at £150 to £250.
The one-size concept is genuinely divisive, though. There's no cup sizing, and minimal structured support by design.
In summer sales at NET-A-PORTER, Selfridges and Flannels, Hunza G regularly drops 30 to 50%. That can bring a set close to the £100 mark.
- Choose it if: you want the icon and can stretch the budget or wait for a sale.
- Skip it if: you need bust support, or one-size-fits-most gives you pause.
9. Melissa Odabash: the designer benchmark
Melissa Odabash is true designer resortwear, crafted in Italy with shape-retaining fabrics and built-in SPF 50+. It's priced accordingly: tops and bottoms are £110 to £128 each, so a set runs £220 to £256.
We include it as the benchmark for what designer pricing looks like. Outlet and end-of-season sale pieces occasionally fall under £100 per item, and if you find one, the London label's Italian construction is worth it.
- Choose it if: money is no object, or you're hunting the sales.
- Skip it if: you want a full set under £100. That's simply not what this brand is.
How to get genuine designer swimwear under £100: shop the sales
Between June and August, UK luxury retailers discount swimwear by 30 to 60%. The reliable hunting grounds:
- NET-A-PORTER swim sale for Hunza G, Zimmermann and Melissa Odabash
- Selfridges swimwear for Away That Day, Monday Swimwear and Hunza G
- Flannels swimwear sale for Frankies Bikinis and other US labels that carry heavy UK import markups at full price (Frankies runs £180 to £250 a set)
The trade-off: sale stock is end-of-season, sizes are broken, and colourways are last year's. Buy from a brand that's genuinely under £100 at full price and you get full size runs and this year's colours.
How we chose these brands (methodology)
- Prices verified July 2026 directly on each brand's own UK-facing site (or, for US brands, their UK retail listings), calculated as a full set: one top plus one bottom at full price.
- Fabric and construction: we favoured double-lined, thick-handle fabrics, recycled fibres, and structural details like boning, underwire and adjustability over prints alone.
- UK availability: UK-based brands, or those with dedicated UK stores and webstores, ranked ahead of import-only labels.
- Fit range and reviews: size ranges and verified customer reviews were checked for every brand.
- Bias disclosure: Bareneath is our brand. We've kept its entry the same length and format as every other entry, stated what it doesn't do (cup sizing), and priced all competitors from their own sites, not from memory.
FAQs: luxury bikinis under £100 in the UK
Are any luxury bikini brands actually under £100 per set in the UK?
Very few, at full price. Verified July 2026: Bareneath (£94), Chelsea Peers (£62 to £68), Boux Avenue (£50 to £75) and Calzedonia (£52 to £72) come in under £100, and Seafolly's entry styles can reach £95. Hunza G (£175 plus), Melissa Odabash (£220 plus), Away That Day (£150 plus), Monday Swimwear (£130 plus), Bond-Eye and Frankies Bikinis all exceed £100 per set at full UK prices.
What should a quality bikini actually be made of?
Look for a blend of around 80% polyamide (nylon) and 20% elastane. Recycled polyamide, like that used by Bareneath and Away That Day, performs identically to virgin fibre. Double lining is the single biggest quality marker: it adds opacity, structure and fabric weight. Construction details like side boning, adjustable straps and underwire separate luxury-grade pieces from fast fashion.
Which luxury bikini brands are UK-based?
Bareneath, Hunza G, Melissa Odabash, Away That Day, Chelsea Peers and Boux Avenue are all UK brands. Seafolly is Australian with a dedicated UK webstore, and Calzedonia is Italian with UK stores. Monday Swimwear and Frankies Bikinis are American, sold in the UK through Selfridges and ASOS.
Which bikini brand under £100 is best for bigger busts?
For true cup-sized fitting under £100, Boux Avenue is the strongest option thanks to its lingerie heritage. If you can stretch beyond £100, Monday Swimwear's underwired styles run to a G cup (including 28E to 34DD sizing) and are the best-engineered supportive bikinis in this guide.
When do luxury swimwear sales happen in the UK?
The main markdowns run from late June through August, when NET-A-PORTER, Selfridges and Flannels discount swimwear 30 to 60%. A second, smaller window hits in November around Black Friday. Current-season stock from under-£100 brands rarely needs discounting, which is why their full-price value matters.
Is a £94 set really comparable to a £175 one?
On fabric composition, often yes. Bareneath's 80% recycled polyamide and 20% elastane blend is the same class of fabric used by brands charging double, and double-lined seamless construction is a like-for-like feature. What you give up under £100 is usually brand cachet, made-in-UK or made-in-Italy production, and specialist features like Melissa Odabash's SPF 50+ fabric or Hunza G's proprietary crinkle.
Prices checked 19 July 2026 on each brand's own UK site and may change, particularly during sale periods. This guide is published by Bareneath. The disclosure and methodology above explain how competitors were assessed. Product images are shown via each brand's own website.