Undergarments as part of humans' clothing are intended to lessen the friction between the skin with outer garments.
They also serve to keep outer garments from being soiled or damaged by bodily excretions, to shape the body, and to provide concealment or support for parts of it. In cold weather, long underwear is sometimes worn to provide additional warmth.
Below are presented a boxer, a set of undershirts, and an example knit fabric used to make lingerie.