That piece of plastic in the swimwear grosses me out. I have never looked at that and thought it was ok to go completely nude when trying on swimwear. Some people (Emmy Lou) are pigs.At the very minimum, the swimsuits should have a sanitary strip so nothing can get through - but some people are feral and tear it off!
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I don't know about you guys, but whenever I've tried on swimwear or underwear, there have been signs right around the changing rooms about how undergarments MUST be left on underneath!