Throughout our years of following fashion, we’ve watched underwear trends fluctuate more precipitously than the proverbial whale tail. In the ’90s, it was all about Kate in those Calvin Klein briefs; in the aughts, the literal rise of the barely-there, bedazzled g-string coincided with the downward descent of pant waistlines; in the current decade, granny-panty-esque cotton underwear from small-batch indie brands are center stage. One pair of drawers, however, has faithfully remained in our drawers throughout the ebb and flow of cheek coverage: the panty-line-preventing thong.