ribbed leotard

A leotard that has vertical lines made to resemble a ribbed pattern.

Should note if searching for these in real life they are not actually leotards, but instead called a "bodysuit." The term referring to a leotard-like garment made from different material worn in replacement of a shirt. These are different from the full body covering used for the bodysuit tag on Danbooru.

This tag implicates leotard (learn more).