Low-Rise Bikini | Mahogany - Classic Bikini Style Women's Underwear

Underwear Size Chart

underwear size chart in inches

Need to know how to measure your underwear size? Click Here!

Between sizes? Go for the larger option for a comfier fit, go smaller for a firmer + more snug fit.

ITERATION SIZE	US DRESS SIZE	WAIST (INCHES)	HIPS (INCHES)
XS	0 - 4	24" - 26"	34" - 37"
S	4 - 6	26" - 28"	37" - 39"
M	8 - 10	28" - 31"	39" - 41"
L	12 - 14	31" - 34"	41" - 44"
XL	16 - 18	34" - 37"	44" - 47"
1X	18 - 20	37" - 41"	47" - 51"
2X	20 - 22	41" - 45"	51" - 55"
3X	22 - 24	45" - 49"	55" - 60"

NOTE: Our fabric is really stretchy and two sizes might work for some people. If you prefer a firmer fit, we suggest selecting the smaller size. If you prefer a comfier fit, we suggest selecting the larger size.

If you're selecting a low-rise or mid-rise style, we recommend you base your size mostly on your hip measurement.
If you're selecting the high rise style, pick the size where the measurement range falls closest to both of your measurements.

Don't see your size here? We continue to add sizes based on community feedback. Let us know what size you need by joining the community.

FREE + EASY RETURNS OR EXCHANGES

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FREE SHIPPING ON $70 OR MORE

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Low-Rise Bikini | Mahogany

Need to Know Details

LOW-RISE | sits below your natural waist, sides can be worn on low or high hips
STANDARD LEG LINE | follows the natural curve of your leg line
MINIMAL SEAT COVERAGE | a peek of cheek will be exposed, but nothing wild ;)
NO UNCOMFORTABLE ELASTICS | won't dig into your waist or bum
TAGLESS CARE + SIZE LABEL | no itchy tags to get in your way
GUSSET LINING | 15% longer and 10% wider than typical brands
COLORS | Pink Sand, Sienna, Mahogany, Onyx

Materials + Composition

BODY + WAISTBAND | 94% TENCEL™ Modal + 6% spandex
GUSSET LINING | 100% cotton
PRODUCTION | made with 💜 in a small + ethical factory in Sri Lanka; designed in USA

Care Instructions

WASH | machine wash cold
LINE DRY | hang dry to save energy
MACHINE DRY | if machine drying, tumble dry on low
STAINS | only non-chlorine bleach as needed

Returns + Exchanges

Fit Matters. We’ve Got You.

Comfort and fit are everything, especially when it comes to bras+ undies. Helping you discover your next era of intimates is our jam, made easy for you with free returns and exchanges.

Returns of unwashed, unworn items with the tags on are accepted for 30 days and will be refunded to the original form of payment. See our Returns Policy for more details.

Still have questions? Not a problem!

For style suggestions, take our Bra Quiz

For bra sizing, check out our custom Measuring and Calculator

Still have questions? Shoot us an email at hi@iterationera.com and we can personally assist to ensure you're fitted perfectly!

DIG-FREE UNDERWEAR

Smooth, elastic-free all day comfort

These dreamy undies are pure bliss for your bum. With a double-layer fabric waistband and smooth elastic-free leg openings, they’re built for all-day comfort—without the digging, pinching, or pesky red marks.

Mid-Rise Hipster | Mahogany women's underwear, mid-rise hipster, full coverage panties iteration

About Our Fabric

94% TENCEL™ Modal + 6% spandex

We dig our fabric for many reasons, here's just a few of our top favorites:

2X softer than cotton, tough enough for all day adventures

Natural material made sustainably from regenerative beech trees

50% more absorbent than cotton with odor resistance

Wireless Bras and Elastic Free Underwear

Cosmetic Neutrals

Beautiful nudes to match your skin tone

Our carefully curated palette celebrates the beauty of neutral nudes, offering a spectrum of makeup-inspired shades that flatter all skin tones.

iteration ethical manufacturing factory workshop underwear sew by samples

four-diverse-models-wearing-complimentary-modal-bras-and-underwear

94% TENCEL™ Modal + 6% spandex

BETTER FABRIC, BETTER FEEL

We love our fabric for a lot of reasons—like being 2X softer than cotton, naturally breathable, and sustainably made from regenerative beech trees. It’s cozy, moisture-wicking, and tough enough for everyday wear (with odor resistance, too).

Learn more about TENCEL™ Modal

community-powered + shaped by you

CO-CREATED BY 1,200+ WOMEN

Every style is co-created with input from over 1,200 women—wear tested, refined, and perfected through real feedback and community-led design. Thoughtfully made, because your voice matters.

Join our Co-Lab Community

Made to fit diverse + ever changing bodies

FITS INCLUSIVE SHAPES + SIZES

Our inclusive range spans XS to 3X with bras offered in both standard and full-busted options from A to G cups. Every style is wear-tested and refined with our community to ensure a supportive, feel-good fit.

About Our Inclusive Size Range

Conscious Creation from Fabric to Factory

SUSTAINABLE + ETHICALLY MADE

We use premium, eco-responsible materials and partner only with manufacturers who uphold fair wages, safe working conditions, and ethical practices—because how it's made matters just as much as how it feels.

About Our Sustainability Efforts

Reviews

5.0

Rated 5.0 out of 5 stars

Based on 9 reviews

Total 5 star reviews: 9 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0

100%would recommend these products

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9 reviews

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TG
Trudy G.
Verified Buyer
Reviewing
Low-Rise Bikini | Sienna
I recommend this product
Age Range 35-44
Size Purchased S
Rated 5 out of 5 stars
Love these undies!
These were clearly designed with comfort in mind, I have one in every colour and it makes me happy every time I get to pull one out of my undies drawer!
Was this helpful?
I
iteration
Mar 3, 2025
It makes us SO happy knowing our undies bring you joy every time you reach for them - that's exactly what we hoped for when we designed them, making comfort as our top priority. Your enthusiasm and support means the world to us!! 💜
SP
Sally P.
Verified Buyer
Reviewing
Low-Rise Bikini | Onyx
I recommend this product
Age Range 45-54
Size Purchased M
Rated 5 out of 5 stars
Most comfortable underwear, ever.
After losing some weight, I needed a whole new everyday underwear wardrobe, and I bought almost all of it at Iteration, in several colors. The bikini-style cut is so flattering, with the center dip and pleat, but it offers the right amount of coverage. The material is so soft and breathable and non-restrictive, without becoming baggy or loose. They wash beautifully. They check all the boxes for me.
Was this helpful?
RK
Rose K.
Verified Buyer
Reviewing
Low-Rise Bikini | Onyx
I recommend this product
Rated 5 out of 5 stars
Lo-rise bikini
These are comfortable, and luxurious at the same time!! The fit is great - ordering and returns are a breeze. I love supporting a company with beautiful and sustainable fabrics!!
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HC
Holly C.
Verified Buyer
Reviewing
Low-Rise Bikini | Onyx
I recommend this product
Size Purchased S
Rated 5 out of 5 stars
Love these
I have bought multiple pair. So incredibly soft and comfortable but yet I still feel sexy with the V front waist detail. They also are pretty seamless so they don’t show!
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I
iteration
Mar 3, 2025
Holly, thank you so much for your incredible feedback! We're so thrilled to hear that you love them enough to buy multiple pairs. Thanks again!!
MD
Mary D.
Verified Buyer
Reviewing
Low-Rise Bikini | Sienna
I recommend this product
Age Range 45-54
Size Purchased M
Rated 5 out of 5 stars
The v front
The crossover front that dips seriously snatches my waist in !!!! It may be an illusion but I’ll take it !!!! This color is such a beautiful neutral!!!!
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