What underwear to wear under leggings: a practical guide

Leggings are a staple in many women's wardrobes, whether for working out, working from home, traveling, or simply for a comfortable day. But a common question arises: what underwear should you wear under leggings to avoid lines and stay comfortable all day?

The answer depends on the cut, material, and finish of the underwear. A poor choice creates visible lines and discomfort. A good choice disappears completely.

Why Leggings Make Underwear More Visible

Leggings fit close to the body. Their stretchy fabric, typically a blend of nylon, polyester, and elastane, follows every movement and curve. This characteristic, which makes them so comfortable, also explains why underwear becomes more visible under this type of garment.

Three elements amplify this phenomenon: the elasticity of the fabric that reveals seams, the very close fit that leaves little space between the garment and the skin, and the thinness of some yoga or sports leggings that makes lines even more apparent.

The Most Effective Options Under Leggings

Seamless Briefs

This is the most reliable option for fitted clothing. Seamless briefs are made using circular knitting, which eliminates side seams. Their edges are laser-cut rather than sewn, creating an ultra-flat finish that leaves no trace under the legging fabric.

LICA Wear seamless briefs are designed precisely for this purpose: to hug the body without creating visible lines, even under the tightest leggings.

Seamless Thongs

Seamless thongs are one of the most popular options under leggings. Their minimal cut at the back reduces the amount of fabric and thus visible lines. Contrary to some misconceptions, a well-designed thong made of soft, stretchy material can be very comfortable all day long.

Seamless Brazilian Briefs

Seamless Brazilian briefs cover more of the buttocks than thongs while remaining discreet. They are a good compromise for those who want more coverage without sacrificing invisibility under leggings.

Seamless Bikini Briefs

Seamless bikini briefs work well under thicker leggings or everyday leggings rather than sports leggings. Their larger surface area may be slightly more visible under very thin leggings but remains discreet thanks to their laser-cut edges.

Preferred Materials

Nylon and Elastane

Nylon is lightweight, durable, and soft on the skin. Combined with a high elastane content, it creates a 360-degree stretchy fabric that follows body movements without creating tension or creases.

LICA Wear briefs are made from 63% nylon and 37% elastane, an elastane percentage significantly higher than the market average. This composition ensures that the briefs stay in place and do not create pressure points, even during a workout.

Cotton Gusset

Even under sports leggings, the presence of a 100% cotton gusset is important. Cotton absorbs moisture and ensures optimal breathability in the crotch area. To learn more about the importance of this detail, consult our guide on cotton gussets.

According to the American College of Obstetricians and Gynecologists, underwear with a cotton lining in the crotch is recommended for maintaining intimate health, even during physical activities.

Common Mistakes That Create Lines

Thick Seams

Briefs with thick traditional seams easily show through leggings. The bulkier the seam, the more visible it is.

Overly Stiff Elastics

An elastic that pinches the skin creates a sharp line visible through the legging fabric. Briefs where the elasticity is integrated into the fabric itself, rather than in an added elastic band, do not have this problem.

Wrong Size

Briefs that are too small compress and create marks. Briefs that are too large wrinkle and move around. Size is often the primary cause of visible lines under leggings. Consult our size chart to find your exact size, and our guide on choosing your size if you're unsure.

Under Sports Leggings: Some Details

Sports leggings impose additional demands. During a workout, the body sweats more, moves in multiple directions, and experiences more friction.

Invisible sports underwear must offer good breathability, high elasticity, and stable support that requires no adjustment during effort. Lightweight synthetic fabrics like nylon-elastane are best suited for these reasons.

For a complete guide on underwear suitable for an active lifestyle, consult our article on underwear and athletic performance.

Can You Wear Leggings Without Underwear?

Some women choose not to wear underwear under their leggings. This is possible, but many leggings are not designed to replace underwear: they may lack lining or retain more moisture.

Wearing invisible briefs under leggings improves hygiene, reduces friction, and extends the life of the leggings by reducing direct wear on the fabric.

FAQ

How to avoid panty lines under leggings? Opt for seamless briefs with laser-cut edges. These ultra-flat finishes create no visible lines under the stretchy fabric of leggings. Seamless thongs or Brazilian briefs are the most effective options under the tightest leggings.

What material is best suited under leggings? Nylon combined with a high percentage of elastane is the most effective combination: lightweight, soft, stretchy, and breathable. A 100% cotton gusset complements this composition by ensuring breathability in the crotch area.

Is a thong really comfortable under leggings all day? Yes, provided the thong is well-designed with a soft, stretchy material. A seamless thong with laser-cut edges stays in place without rubbing or creating discomfort, even during long hours of wear.