Guys, How do men do this?

So i was walking home, wearing a long loose rain jacket that covers my butt, zipped up. Two guys walking behind me was saying that I had a nice body.

I do eat healthy and workout, but how do guys know? I was wearing loose clothing which hides my figure! I don't get it. I'd maybe understand if I was wearing tight clothes. But they were loose, not transparent and modest... :(
Guys, How do men do this?
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