Last Updated on September 27, 2026 by Kasey Lynch
A lot of “clean” underwear brands stop at a Large. Plenty of them say “for every body” on the homepage and then don’t sell beyond an XL.
So I found ten natural fiber brands that not only create true plus sizes, but I even tested styles from some of these brands to see how they stand up against my 100-point scorecard system.
A note on method. I used the brand’s own size chart wherever I could get it. Although the size charts are helpful, hip measurements are the most useful way to compare brands because labels don’t match across brands.
One brand’s XXL can be another brand’s XL, so read this list with discretion and double check before purchasing.
This list of plus size natural fiber underwear brands is just the beginning! Bookmark it to check back as the list grows.
The widest range of plus size natural fiber underwear: up to 6XL
Thunderpants
Thunderpants goes further up the size range than anyone else on this list. The Original comes in sizes XS-6XL and is made in Portland, OR from their 90% organic cotton / 10% spandex fabric.
The waistband is also unique. Instead of elastic, they cut wide strips of the same organic cotton blend for the binding, so there’s no elastic against your skin. The Original underwear style is comfortable
For sizing, go by your hip measurement rather than your waist, and size up if you’re between sizes. They say the pair lasts longer when it isn’t stretched too far.
Up to 5X
Pansy
This is the brand for anyone trying to cut synthetics out completely. Pansy uses undyed organic cotton jersey, natural rubber elastic, organic cotton thread, and an organic cotton tag.
The size range comes from a stockist, because Pansy’s own chart wasn’t accessible. That stockist lists sizes from XS (00-0) to 5XL (30–32). Natural rubber elastic is latex, so check with your allergist if you have a latex allergy.
4X natural fiber underwear brands
Subset
Subset offers its core underwear styles in 2XS–4XL, from thongs to high-rise briefs. The main body fabric is 95% certified organic cotton and 5% elastane, with the waistband using nylon.
Subset is a great example of what to look for when evaluating natural fiber underwear. That means the majority of the garment is made from certified organic cotton, while a small amount of synthetic fiber is used where additional stretch and support are needed..
Cherri
Cherri is built around a wider gusset designed to prevent lip slip, and it sells thongs, briefs and bikinis in sizes XS-4X.
The fabric blends organic Supima cotton with TENCEL™ Modal. The modal is semi-synthetic made from wood pulp that’s regenerated into fiber, which is the reason the fabric dries faster than straight cotton.
That makes Cherri a good middle ground if you’re moving away from synthetics but still want some moisture control. It’s also the brand I’d point people to for a plus-size thong, since most brands’ thong sizing stops well before 4X.
My full Cherri underwear review covers the fabric and fit in more detail.
Coming Soon
The Better Goods Field Guide
I’m digging into sizing, transparency, and more to help you find natural fiber brands you can feel good about shopping. Join the waitlist for first access to the rankings.
Join the WaitlistNet Positive
Net Positive offers a fairly broad size range, but the maximum size varies depending on the fabric. Their organic cotton line features GOTS-certified organic cotton and is available from XXS through 4XL, while their organic cotton and hemp styles currently go up to 3XL.
If you’re shopping in the extended size range, it’s worth checking the individual product page before you fall in love with a style!
Natural fiber plus size brands up to 3XL
Huha
Huha’s largest size, a 3XL, is listed at 44-47″ waist and 50-55″ hips, which fits like a US 18-20. They recommend using your waist measurement for high-rise styles and your hip measurement for low- and mid-rise styles.
The Mineral line has a shell of 90% TENCEL Modal Micro and 10% spandex, and a lining of 98% TENCEL Lyocell with pharmaceutical-grade zinc oxide and 2% spandex. Modal and lyocell are semi-synthetic, so they aren’t natural fibers the way cotton and hemp are.
I’m including Huha because it fills a real gap at the top of the size range while still using a naturally-derived fabric that’s designed with women’s health in mind. Head’s up though, the brand also says it isn’t suitable for anyone with a zinc allergy or sensitivity.
Oddobody
Oddobody is one of the few brands in this post that uses 100% cotton for the fabric itself, with no spandex blended in. Their size chart goes from XS (US 0-2) to XXXL (US 20), and XXXL is listed at 41″-45″ waist and 50″-53″ hips.
A caveat if you have a bigger butt: With no spandex in the fabric, these stretch less than blended underwear. If your hips and seat are much larger than your waist, getting them up over your hips can be a squeeze, even when the size fits fine once they’re on. Size up if you’re between sizes, and read the fit notes for each style.
Oddobody says the French cut, thong, brief, mid-rise brief and sleep short tend to run true to size. The string bikini and tanga run small, so they recommend sizing up. The hipster runs big, so they recommend sizing down. I can personally confirm, the tanga runs small and the bikini waistband is a little tough to get over your hips, but comfortable once it’s on.
The details matter when you’re ordering from this brand.
Q for Quinn
Q for Quinn is listed in sizes XS-3XL. The brand says their underwear usually runs true to size, but 100% organic cotton stretches less than most people are used to. That’s the same caveat as Oddobody for their all-cotton styles.
Their product pages show how the fit looks on real bodies, which is always refreshing to see. Some styles are plastic-free, but the brand notes those aren’t suitable for people with latex allergies.
La Coochie
La Coochie offers sizes 2XS to 3XL in every style. All of its underwear is made from GOTS-certified fabric that is 95% organic cotton and 5% elastane, and the gusset is GOTS-certified organic cotton too.
They also use OKEO TEX certified lace to add a nice detailing to their designs, elevating the style above your boring everyday pair of knickers.
If you want a full deep dive, my La Coochie review has scores for each tested style and a breakdown of the brand.
Organic Basics
Organic Basics lists its underwear in sizes up to 3XL. But, it’s important to read the fabric details closely. The brand uses organic cotton, TENCEL™ Lyocell, and other materials, and says outright that its fabrics are sometimes organic and sometimes not.
Stick to the styles that list organic cotton, and check the size range on each product page.
I pulled together some of my favorite organic cotton styles below to make it easy for you. The Core Shorty scored an 87 on my scorecard system.
Quick comparison
| Brand | Size range | Main fiber | Watch for |
|---|---|---|---|
| Thunderpants | XS–6XL | 90% organic cotton / 10% spandex | Size up if between sizes |
| Subset | 2XS–4XL | 95% organic cotton / 5% elastane | Nylon elastics |
| Cherri | XS–4X | Organic Supima cotton + TENCEL Modal | Gusset runs wide |
| Net Positive | XXS–4X listed | Organic cotton, cotton/hemp | Range varies by style |
| Huha | 2XS–3XL | TENCEL Modal (semi-synthetic) | Zinc sensitivity |
| Oddobody | XS–XXXL | 100% organic pima cotton | Tight squeeze over hips |
| Q for Quinn | XS–3XL | 95–100% organic cotton | Less stretch; latex in plastic-free styles |
| Pansy | XS–3XL | 100% organic cotton | Natural rubber (latex) elastic |
| La Coochie | 2XS–3XL | 95% organic cotton / 5% elastane | — |
| Organic Basics | Up to XXXL | Mixed; check each style | Not all organic |
The bottom line
Your underwear is probably the most-worn thing you own. It’s on your body every single day, often for hours at a time (sometimes overnight too), sitting right against some of your most sensitive skin.
That’s exactly why it’s such a smart place to start if you want more natural fibers in your wardrobe. You don’t have to overhaul your whole closet, and not every piece needs to be 100% natural. A pair that’s 90 to 95% organic cotton with a touch of elastane for stretch is still a real step away from the synthetic-heavy underwear most of us grew up wearing.
And your size should never be the thing standing in your way. Better underwear belongs on more bodies, not just the ones brands have historically chosen to design for.
My hope is that this list takes some of the frustration out of the search, so you can pick what actually feels right for you instead of settling for whatever happens to come in your size.
Before you order, grab a measuring tape. Measure your hips instead of going by your usual size, check each brand’s actual size chart, and if you land between sizes, size up.
You deserve underwear that fits well, feels good, and is made from materials you trust, without having to choose between them.
