Caption This: Serena Williams' Hot Pink Full-Length Tennis Onesie

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Tennis pro Serena Williams tweeted this photo of herself wearing a long-sleeve, full-length, skin-tight, hot-pink onesie the other day. And she's playing tennis. We have so many questions about this look—like, what sort of undergarments does one wear under neck-to-ankle pink Spandex? And why on earth would someone choose to wear this to play tennis (though, to be fair, we know almost-nothing about sports, so this may just be a side effect of our own ignorance). Anyone have any insight? Have at it in the comments, please.
· @serenawilliams [Twitpic]