Young Brunette Girl Wearing Undergarments On The White Couch

Underwear is sometimes partly exposed for fashion reasons or to titillate. A woman may, for instance, allow the top of her brassiere to be visible from under her collar, or wear a see-through blouse over it. Some men wear T-shirts underneath partly or fully unbuttoned shirts.
A common style among young men is to allow their trousers to sag below their waists, thus revealing the waistband or a greater portion of their boxer shorts, briefs, or boxer briefs. A woman wearing low-rise trousers which expose the upper rear portion of her thong underwear is said to display a "whale tail".
• Not wearing undergarments
Not wearing underwear under one's outer clothing is known in American slang as freeballing for men or freebuffing for women; in addition, the term going commando is used for both sexes. Some people chose not to wear any underwear. People chose not to wear underwear for reasons of comfort, to enable their outer garments (particularly those which are form-fitting) to look more flattering, to avoid creating a panty line or because they find it sexually exciting, or because they do not see any need for them.