I understand these suckers are still in fashion, but around my middle school years, they became all the rage. (Had “tankini”, as a word, even existed before then? Not sure. UPDATE: NO, this tankinis were actually only made/marketed in the late 1990s.)
Basically, if a one piece and a bikini had a baby, this would be it. Leaving just a small band of skin around your stomach, these things were the height of fashion (and were great for those of us who were just a bit more modest at the pool.)
The worst offenders, though, would have to be the tankinis that had criss-cross straps in the back. It basically created this flap of fabric over your stomach, and your back was still entirely exposed. Talk about weird tan lines!