To grade pilling and sheer wear on used leggings, run two tests: a light test that checks the seat and thighs for see-through fabric, and a stretch test that checks whether the fabric and waistband snap back. Pilling alone usually costs you one tier at most. Sheerness or elastic fatigue can drop leggings to Good or Fair no matter how clean they look.
Here is the return we see most often. A seller lists black leggings as Excellent. The photos are flat on a bed, under soft light. The buyer puts them on, bends over, and sees skin through the seat. Return, "not as described," and a refund on a pair that sold for a fair price. The seller never saw the defect because they never stretched the fabric under a light. This guide fixes that.
Why leggings need their own grading method
Leggings are knit fabric under constant tension. Wear shows up differently than on a woven shirt or a pair of jeans. Three defects combine to set the grade:
- Pilling sits in Cosmetic Appearance, and sometimes in Fabric Condition when the pills sit on thinned yarn.
- Sheerness sits in Fabric Condition. The knit has opened up and the fabric no longer covers.
- Elastic fatigue sits in Functional Elements (waistband) and Structural Integrity (recovery of the knit itself).
Buyers weigh these very differently. Pilling is visible in a photo and most buyers forgive it on a used pair. Sheerness is a wearability failure, and nobody forgives it. That is why a legging with heavy pilling and sound fabric can outgrade a smooth-looking pair that goes see-through when stretched.
The light test for seat and thigh sheerness
Sheerness hides at rest. The knit looks opaque when it is relaxed, then opens when it is stretched over a body. So you test it stretched, with light behind it.
- Turn the leggings inside out and check the seat and inner thigh for shine or a flattened, glassy look. Those are early signs of thinned fibers.
- Pull the seat panel over your hand or a fist, stretching it the way a body would.
- Hold it in front of a bright window or a phone flashlight, with the light behind the fabric.
- Look for the weave pattern showing through, or for your skin tone reading as a distinct color. Compare with the waistband or the calf, which wear less.
- Repeat on the inner thighs, where friction thins fabric first, and on the knees.
- Photograph any thin area stretched, with the light behind it, so the buyer sees what you saw.
The comparison step matters. Every legging lets some light through when stretched. What you are looking for is a clear difference between the worn zones and the unworn ones. Dark colors hide sheerness in photos and in the mirror, so the light test is most important on black, navy, and charcoal.
The stretch test for elastic fatigue and recovery
Elastic fails in two places: the waistband and the knit itself. Test both.
- Stretch the waistband to roughly double its width and release it. It should return to its starting size within a second or two.
- Check the waistband for rolling, waviness, or a loose, wavy edge. Those show the elastic has lost tension.
- Pinch a section of the thigh fabric, stretch it, and let go. Look for a baggy ghost shape at the knees or seat that stays after the release.
- Lay the leggings flat and compare waist and inseam to the tag size or a reference pair. Leggings that measure noticeably larger than the tag have stretched out.
- Check any drawcord, internal pocket, or gusset for popped seams, since the elastic strain concentrates there.
Slow recovery is a functional failure. It sits in Functional Elements, and it matters more than a cosmetic flaw because the garment will not stay up or hold shape on the body.
How to read pilling on leggings
Pilling on activewear comes from friction: inner thighs, under the arms on tops, and where a bag strap rides. Sort it by density and by what is underneath.
- Light, scattered pills with solid fabric underneath are cosmetic. A fabric shaver often clears them.
- Dense clusters across the inner thigh with no thinning are heavier cosmetic wear.
- Pills over thinned yarn are a Fabric Condition issue. Shaving removes the pills but not the thinning. Run the light test on the same area before you decide the pills are cosmetic.
One honest warning: shaving a legging can thin the knit further. If you shave, do it lightly and re-check the area under light afterward. A pair that looked fine before shaving can show sheer spots after.
Tier placement for used leggings
These are guide lines, not guarantees. Your call on a specific garment depends on how the five factors combine. Use this table as a starting point.
| Tier | Pilling | Sheerness (light test) | Elastic (stretch test) |
|---|---|---|---|
| NWT / NWOT | None | None | Full recovery, no stretch-out |
| Excellent | None to a few faint pills | No difference between worn and unworn zones | Full recovery |
| Very Good | Light, scattered | No visible thinning | Full recovery, waistband crisp |
| Good | Moderate, clustered at thighs | Slight thinning at seat or thighs when stretched | Slightly slow recovery, minor waistband rolling |
| Fair | Dense, over thinned fabric | Clear see-through when stretched | Baggy knees or seat, loose waistband |
| Poor | Heavy | Visible holes or sheer at rest | Elastic failed or waistband detached |
Notice that sheerness moves the tier faster than pilling does. A pair with moderate pilling and no thinning can sit at Very Good. A pair with almost no pilling and clear see-through at the seat is Fair, because it fails the basic job of covering.
Odor, structure, and the rest of the five factors
Do not stop at the fabric. Synthetic knits hold sweat odor in the seat and waistband even after washing. Run a sniff test on the damp-warm areas, and note it under Odor & Cleanliness. Check Structural Integrity too: popped flatlock seams, a torn gusset, or a pocket pulling away from the waistband. Check Functional Elements for a waistband that rolls, a drawcord that has pulled out, and zippers on ankle or pocket details.
A pair can score well on Fabric Condition and still land in Good because the waistband will not stay up. The grade reflects the weighted combination, not the best single factor.
What to write in the listing
Name the test and the result. "Light test: no visible thinning at seat or thighs. Stretch test: waistband returns fully. Light scattered pilling at inner thigh." That is specific, checkable, and it matches what a buyer will see on arrival. On eBay, put the grade and the defect note in the description and the condition field. On Poshmark and Mercari, where buyers negotiate hard on activewear, a stretched-under-light photo of the seat tends to end the "is it see-through?" question before it becomes an offer or a dispute.
If the seat fails the light test, say so plainly and price for Fair. A disclosed flaw sells at a discount. An undisclosed one comes back as a refund plus shipping.
Grade one pair and compare
Pick one pair of leggings from your stock, run the light test and the stretch test, and note what you find in each of the five factors. Then grade the same pair in GradeThread and compare the condition report to your own call. If the report catches a thin seat or a tired waistband you missed, you have just seen what a buyer would have found first.