When bombshell “Baywatch”-era one-pieces and teeny bikinis reigned in the 1990s, relief for many women came in the form of the tankini — a tank-top silhouette that offered more coverage than most two-pieces, but could still be modest, sporty or sexy. It was one of the few innovations at a time when women’s swim styles only catered to few body types and style preferences — and even got the stamp of approval on Sports Illustrated’s 1990 Swimsuit Issue cover.