The micro bikini skyrocketed in popularity in the early and mid-1970s as an evolution of the popular string bikini. Bans on nudity on public beaches led to their development. This type of bikini offers even less coverage than a thong.
In order to comply with anti-nudity laws, beach-goers stitched their own suits together using as little fabric as possible and covering only enough of the body to keep from being arrested.
A typical micro bikini may have nothing but a thin string around the waist and up the buttocks and a small piece of fabric covering the crotch. The top has little more than two patches to cover the nipples and a couple of strings to hold them in place. For men, this model leaves the entire buttocks exposed with only a small piece of fabric covering the groin.