What to Wear Under Fitted Outfits

Leggings and fitted athletic wear are the hardest test for underwear because the stretch fabric clings closely to whatever is underneath. The front silhouette in particular can show visible gaps, bunching, or panty lines very clearly. A seamless style or a reinforced-front style like Purty Body gives the cleanest result.

• Seamless styles eliminate side and back panty lines under stretch fabric.
• Reinforced front panels — like those in Purty Body — smooth the front silhouette specifically.
• A thong or low-rise cut avoids visible back lines under high-waisted leggings.
• Avoid cotton styles, which tend to bunch and hold moisture during active wear.

Tailored trousers and fitted skirts are slightly more forgiving than leggings, but visible lines at the hip, across the front, or at the waistband still detract from the polished look you are going for. A flat-seam or seamless mid-rise brief, or a low-cut bikini that sits below the trouser waistline, tends to work best.

• Flat-seam or seamless briefs in a nude-to-skin tone are the most versatile choice.
• The waistband should sit below your trousers' waistline or be cut to match exactly — no peeking.
• Microfiber or modal fabrics sit flat and breathe better than cotton under structured clothing.
• Thongs are a reliable option if you dislike any back-line visibility in fitted skirts.

A bodycon dress leaves little room for error. A thong or very minimal coverage brief in a color that does not show through the fabric tends to be the simplest, most effective choice. If the fabric is sheer or very thin, a nude-to-your-skin tone is more important than seamlessness.

• A thong eliminates back and side lines entirely.
• Choose a color that matches the dress or your skin tone — avoid bright colors under thin fabric.
• Low or invisible waistbands prevent lines across the hip or lower stomach.
• Shapewear shorts can work but tend to add heat and restrict movement over a long evening.