If you've seen a lot of fanart, you've probably seen at least one female character in this outfit:
It's the outfit worn by the waitresses at the (currently mostly defunct) Playboy Club, which was basically a higher-class version of Hooters from the sixties to the eighties. After the club chain disappeared, the outfit became popular as a fanservicey outfit in anime and manga, and went on to become popular in fanart both in Japan and other countries. It's often called the "bunny suit" be people unfamiliar with its origins.
Y'all think this warrants an entry? It's pretty similar in concept and spread to the Zero Suit, and that's already got its own entry.