Cycle clothing
From wipipedia.org
Cycle shorts are tight lycra shorts sometimes worn by cyclists. They may be padded to increase comfort for someone sitting on a saddle.
Inevitably, such shorts clearly outline the buttocks, especially if someone is sitting on a bicycle and rises off the saddle. On men, they can also show male bulge. Sometimes they show VPL. Some shorts, particularly white ones, may be slightly see-through.