







Sieve Trim Bralette in Buff Boa
Sieve Trim Bralette
Straight cut. Trim detail. Best selling mesh.
Our most-loved Belgian micromesh in a bandeau-style cut with multi-use straps that can be worn straight or x-back.
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Free US shipping on all orders from now through 12/31.
Fit
- Size Chart
- Use this as a guide. Preference is a huge factor — if you’re near the top of a size range and/or prefer more coverage, you may want to size up.
- Open mesh trim top and bottom band detail
- Multi-use straps can be worn straight or in an X-back style, noting straps are not fully removable
- Wireless
Fabric + Care
- Made from a sheer Belgian power micromesh — nipples are visible
- Tonal snakeskin print on our caramel-y sunrise affogato desert sands Buff base
- 74% Polyamide (Nylon) 26% Elastane (Spandex)
- Machine wash warm, hang dry, wear often
FAQ
- Price-slashed, Last Chance Sale items with a red SALE tag are direct size exchange only (no refunds).
- All full-priced, unworn items, with tags attached and in their original packaging are eligible for return or exchange within 30 days of placing your order.
- Please note, packs must be returned in full. We do not accept partial returns of packs.
- Want to know our full returns policies? Here you go.
- Want more info about shipping, materials or care instructions? Here!
Q’s on fit or sizing? Email us at hello@negativeunderwear.com




Non-Wire Bra Sizing
Your underbust: | A | B | C | D | DD | DDD | G | |
---|---|---|---|---|---|---|---|---|
24-26" | 30 | 0 | 0 | 0 | 1 | 1* | 1+ | |
26-28" | 32 | 0 | 0 | 1 | 2 | 2* | 1+ | 1+ |
28-30" | 34 | 1 | 1 | 2 | 2 | 3* | 2+ | 2+ |
30-32" | 36 | 1 | 2 | 3 | 3 | 4* | 3+ | 3+ |
32-34" | 38 | 3 | 3 | 4 | 4 | 5* | 4+ | 4+ |
35-38" | 40 | 3 | 5 | 5 | 5 | 5* | 5+ | 5+ |
38-40" | 42 | 5 | 5 | 5 | 5* |
* Non-wire bra sizing can vary by preference and if you're toward the top of a size range and prefer more coverage, you may want to size up. For styles available in + sizes (designed with additional support details for our larger cup customers), we find DD's can be on the cusp - if you prefer more coverage and support, we suggest the + bra equivalent for your band size.
Btw, the size nomenclature has changed for Bra Tops. Here's the conversion:
XS=0, S=1, M=2, L=3, XL=4, XXL=5
Q’s about sizing or fit? Email us at hello@negativeunderwear.com

- Melinda L.Verified BuyerSize Purchased 2How it Fits True to SizeAge Range 35 - 44Bra Size 36A2 days agoSize Purchased 2How it Fits True to SizeAge Range 35 - 44Bra Size 36AReviewingSieve Trim Bralette in BlackRated 5 out of 5 starsSo sexy!
I love this bra, the detail is so classic and elegant.
Was this helpful? - Caitlin W.Verified BuyerSize Purchased MHow it Fits True to SizeAge Range 35 - 44Bra Size 36B1 week agoSize Purchased MHow it Fits True to SizeAge Range 35 - 44Bra Size 36BReviewingSieve Trim Bralette in BlackRated 5 out of 5 starsLove
Perfect fit, flattering. New favorite.
Was this helpful? - cornelia d c.Verified BuyerSize Purchased 5How it Fits True to SizeAge Range 55 - 64Bra Size 36DD/E1 month agoSize Purchased 5How it Fits True to SizeAge Range 55 - 64Bra Size 36DD/EReviewingSieve Trim Bralette in BlackRated 5 out of 5 starsGreat find
Love it
Was this helpful? - Robin Kirby G.Verified BuyerSize Purchased 3How it Fits True to SizeAge Range 55 - 64Bra Size 34C1 month agoSize Purchased 3How it Fits True to SizeAge Range 55 - 64Bra Size 34CReviewingSieve Trim Bralette in CherryRated 5 out of 5 starsAMAZING BRA!
Absolutely the best bra EVER!
Was this helpful? - Raven P.Verified BuyerSize Purchased 2How it Fits True to SizeAge Range 25 - 34Bra Size 30C1 month agoSize Purchased 2How it Fits True to SizeAge Range 25 - 34Bra Size 30CReviewingSieve Trim Bralette in CherryRated 5 out of 5 starsMy husband loves this bra but not as much as me.
I’ve never been disappointed by Negative’s bra selection. This bra folds a little where the under boob is but I absolutely love it and my husband appreciated the bright red!
Was this helpful?