Well, there have actually been swimsuits with a shark-skin-like pattern embossed. They apparently worked so well that they were banned in competitive swimming some years ago :P .
EDIT: Found the swimsuit. The one getting the most media attention was, as I recall, the LZR from Speedo, which led to some FINA rule changes in 2010.
Even if Wikipedia is no prime source, here is the article to that suit: https://en.m.wikipedia.org/wiki/LZR_Racer
Started quite a hype in bionics/biomimikry back then :P
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