Cheerleader
From wipipedia.org

In some American sports, a cheerleader is one of a group of women who lead the cheering of the team's fans. Traditionally, they wear scanty uniforms (very short skirts, and crop tops showing the midriff and cleavage) and perform athletic manoeuvres. Often, these manoeuvres are designed to allow spectators to glimpse their panties; in this case, the cheerleaders may wear fancy ones, possibly with lace frills.
Because of their style of dress, cheerleaders are frequently an object of fetish.