FIT GUIDE
How to Stop Leggings Going See-Through in Deep Stretches
January 21, 2026 · Alo Editorial · 3 MIN READ
Opacity is a function of knit density, fabric weight, and colour. Here is how to test a pair before you buy, and what to do about the pair you already own.
A legging can look completely opaque on the hanger and turn sheer the moment you bend. This is not a defect, it is physics. Stretch knits are made of loops of yarn, and when the fabric is stretched the loops open. How much they open depends on the knit structure, the yarn, and the weight of the fabric.
The good news is that opacity is testable before you commit.
The stretch test
- 01Pull the fabric hard across your knee or thigh, the way it stretches in a deep bend.
- 02Hold it up to a light source, or against your hand if no light is available.
- 03Look for gaps between the yarn loops, not just for colour.
- 04Repeat over the hip and seat, where tension is highest.
If you can see structure through the stretched fabric, it will go sheer in a deep fold. If the loops stay closed under tension, the pair will hold up.
Why weight and colour matter
- Heavier knits have denser loops and resist opening under tension.
- Darker colours hide minor sheerness better than pale tones.
- Matte finishes read as more opaque than shiny finishes at the same weight.
- Blends with more elastane can stretch further, which opens the knit more.
What to do about a pair you already own
If a favourite pair has gone sheer over time, the cause is usually thinning from wear and abrasion rather than the original construction. Heat from dryers accelerates it. There is no topical fix that survives a wash, so the honest options are to wear it in contexts where opacity is less critical, or to replace it.
If a pair was sheer from day one, it was simply the wrong weight for deep stretches. Test before buying, and the problem disappears.
What to check before you buy for how stop leggings going see through
Two pieces can look identical on the hanger and behave differently in how stop leggings going see through. The checks below are the ones that catch it early. Navy ALO Softsculpt 7/8 Define Legging is the piece we would test them against first.
- Squat test in a mirror: the fabric should go opaque, not sheer.
- The waistband should sit flat at your natural waist without rolling when you fold forward.
- Check the inseam against your height — a 7/8 length on a tall frame is a crop.
The colour caveat
Pale and mid-tone leggings need more density to read as opaque than black or navy ones at the same weight. If you practise in light tones, apply the stretch test with more scrutiny, and expect to pay attention to weight rather than just colour.
Opacity is about what the knit does under tension, not what it looks like on the hanger.
FREQUENTLY ASKED QUESTIONS
- Do squat-proof leggings exist?
- Yes, in the sense that dense knits resist opening under tension. But the honest test is stretching the fabric yourself, because the same pair can be opaque in one pose and sheer in another.
- Why did my leggings become see-through over time?
- Wear, abrasion, and heat thin the yarn and open the loops. High-heat drying accelerates this. Once the fabric has thinned, it cannot be restored. It is the sort of difference you notice twenty minutes in, not on the hanger.
- Are darker leggings always more opaque?
- Darker colours hide minor sheerness better, but density is the real variable. A sheer black pair is still sheer. Get that one thing right and most of the other decisions stop mattering.
WORTH A LOOK
ABOUT THIS GUIDE
Written by Alo Editorial. Every fit and fabric claim in this guide is checked against the pieces we actually sell — if something does not apply to your size, body or climate, our customer care team will say so. Corrections get published, not quietly deleted.
