Brunette Girl With Nice Underwear

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. People choose to forgo underwear for reasons of comfort, to enable their outer garments (particularly those which are form-fitting) to look more flattering, or because they find it sexually arousing. The practice is not without its risks, particularly for women, some of whom have been the victims of upskirt photographers.
Certain types of clothes, such as cycling shorts and kilts, are designed to be worn or are traditionally worn without underwear. This also applies for most clothes worn as nightwear.