Making your own reusable incontinence underwear is a straightforward sewing project once you understand the three-layer system: a moisture-wicking top layer against the skin, an absorbent middle layer to capture fluid, and a waterproof bottom layer to prevent leaks. The result is a washable garment that can be more comfortable, more affordable over time, and better fitting than store-bought options.
How the Three-Layer System Works
Every effective incontinence garment uses the same basic principle. Liquid passes quickly through the top layer so the skin stays dry. The middle layer absorbs and holds that liquid. The bottom layer acts as a barrier so nothing escapes into your outer clothing. These three layers are sewn into the gusset (the crotch panel) of a regular underwear pattern, creating a built-in pad that looks and feels like normal underwear from the outside.
The gusset panel typically runs from about two inches below the front waistband to a couple of inches below the back waistband, depending on how much coverage you need. For light protection, a shorter panel works fine. For moderate protection, extend it further front and back.
Choosing the Right Fabrics
Top Layer: Wicking Fabric
The layer that sits against your skin needs to pull moisture away quickly. Cotton jersey, bamboo knit, and bamboo-cotton blends all work well here. These natural fibers are breathable and reduce the heat buildup that causes skin irritation. Avoid heavy synthetics like polyester or rayon directly against the skin, as they tend to trap heat and moisture rather than moving it through to the absorbent layer beneath.
Middle Layer: Absorbent Core
This is where material choice matters most. Zorb is a specialty fabric designed specifically for absorbent projects. It soaks up 10 times its weight in liquid and does so in under two seconds, which is roughly 20 times faster than standard absorbent fabrics. Zorb 3D Dimples LITE is a popular option because it’s thin enough to avoid bulkiness while still providing strong absorbency. It comes in bamboo, polyester, and organic cotton versions, all with equal absorbency, so you can choose based on feel and preference.
If you can’t find Zorb, layered microfiber toweling or bamboo fleece also works. You’ll just need more layers to match the same capacity. For light incontinence (small leaks under 5 mL), one or two layers of absorbent fabric in the gusset is usually sufficient. For moderate protection (roughly 6 to 12 mL), use three or four layers. Heavier protection requires additional layers or a wider, longer gusset panel.
Bottom Layer: Waterproof Barrier
You have two main options here: PUL (polyurethane laminate) and TPU (thermoplastic polyurethane). Both are thin, flexible waterproof fabrics that look and feel like stretchy nylon on one side.
TPU is the better choice for incontinence underwear. It bonds to the base fabric through heat rather than adhesive, which makes it more durable through repeated washing. PUL tends to delaminate over time, meaning the waterproof coating separates from the fabric, especially with frequent hot washes. TPU also allows more airflow, which helps with comfort and skin health during extended wear.
Cutting and Assembling the Gusset
Start with any well-fitting underwear pattern, either a commercial sewing pattern or one you’ve traced from a pair you already own. The outer underwear can be made from regular cotton-spandex knit. All the absorbent engineering happens in the gusset.
Cut your gusset pieces in this order from top (skin side) to bottom (outer side):
- One piece of wicking fabric for the skin-facing layer
- One to four pieces of absorbent fabric (depending on your needed protection level)
- One piece of TPU or PUL with the waterproof side facing outward, away from the body
Stack all layers together and baste them around the edges before sewing them into the underwear. This keeps everything aligned and prevents shifting during the final stitching. Then attach the layered gusset to the underwear body the same way you’d sew a regular gusset, sandwiching the raw edges inside the garment so the finished product looks clean.
Sewing Waterproof Fabric Without Creating Leaks
Every needle hole in your waterproof layer is a potential leak point, so your technique here matters. Use a ballpoint or stretch needle in size 70/10 or 80/12. These needles push between the fibers rather than piercing through them, which helps preserve the waterproof coating.
Set your stitch length to 3mm or longer. Shorter stitches perforate the fabric too densely and compromise the barrier. Sew slowly and avoid backstitching directly on the waterproof layer when possible. If you need extra security at seam lines, apply seam-sealing tape (available at fabric stores, often marketed for rain gear) over the stitched areas on the waterproof side. A light coat of waterproofing spray on finished seams also works.
One more tip: use a Teflon or walking foot if your machine has one. PUL and TPU can stick to standard presser feet, causing the fabric to bunch and stretch unevenly.
Managing Odor
Odor is one of the biggest concerns with reusable incontinence garments, and fabric choice plays a role. Bamboo fabrics have natural antimicrobial properties that help reduce bacterial growth. If you want additional protection, look for fabrics treated with polyethylene glycol (PEG) coatings. These nontoxic polymer treatments reduce bacterial and fungal growth by nearly 100% in lab testing, working through a physical mechanism that prevents microbes from attaching to fiber surfaces rather than a chemical one. This means bacteria are less likely to develop resistance over time.
Beyond fabric treatments, the most practical odor control comes from prompt washing. Rinsing the garment in cold water soon after use, then laundering within a day, prevents bacteria from establishing themselves in the absorbent layers.
Washing and Care
Proper laundering keeps your DIY incontinence underwear hygienic and extends its lifespan. Rinse in cold water first to flush out urine before it sets. Then wash in the warmest temperature the fabric labels recommend, using a mild detergent. Run a second rinse cycle to make sure all detergent residue is removed, since leftover soap can irritate skin and reduce fabric absorbency over time.
Skip the bleach, which degrades waterproof coatings and breaks down absorbent fibers faster. Fabric softener is also off-limits because it leaves a waxy residue that repels moisture, which is exactly the opposite of what you need from your absorbent layers. Line drying is gentlest on the waterproof layer, but low-heat tumble drying works if you check the TPU or PUL care instructions. High heat is what causes delamination, so err on the cooler side.
Sizing the Absorbent Area
Where you position the absorbent panel and how large you make it depends on when leaks tend to happen. For stress incontinence (leaks during coughing, sneezing, or exercise), concentrate the absorbent layers toward the front and center of the gusset. For urge incontinence or more unpredictable leaks, extend the panel further toward the back.
A typical gusset for light protection is about 3 inches wide and 8 to 10 inches long. For moderate protection, go wider (4 inches) and longer (12 inches or more), wrapping further up both front and back. You can also taper the ends so the gusset is widest at the center and narrower at the edges, which reduces bulk where you don’t need as much coverage.
Making a test pair first from inexpensive fabric is worth the time. Wear it for a day to check fit, comfort, and whether the absorbent area is positioned correctly before cutting into your specialty fabrics.