Prevent Panty Lines

Not sure what to wear...down there? Style expert Stacy London, host of TLC's What Not to Wear, reveals which types of underwear work best beneath different outfits.

Body shaper before (left) and after (right)

Cellulite is a fact of life—without the proper underwear, it can rear its ugly head in rather unsightly ways (left).

The quickest fix for cellulite? Try the latest generation of body shapers (right). Made from microfiber, these miracle workers will hold you in, slim you down and smooth you out!

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Stacy swears by this seamless body slimmer, part of the Donna Karan Body Perfect Collection. "It does several things—it shapes, it lifts and it smoothes," Stacy says. "Ladies, who doesn't want that?!"

Pants with thong before (left) and after (right)

While white pants are great for summer, Stacy says to be careful. Ideally, you should wear a thong—dark colors are a definite no-no, and white-on-white (left) does not work either.

So what's the secret to wearing a white cotton pant? A nude-colored thong (right).

Stacy sacrifices her own behind to illustrate the most severe crime against style—visible panty lines and bunching (left). Stacy says any full-seat panty will ruin the line of a trouser that is well cut and narrow.

Her solution? A seamless boy short (right). Stacy says they provide perfect coverage and are a great alternative to thongs.

Stacy recommends these seamless boy shorts from Calvin Klein. Unlike the cotton underwear of yesteryear, Stacy says seamless boy shorts go over the butt and the top of the leg to create a completely smooth tush.

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