Weightlifting slippers/sandals. Nothing special. I Think the OP refers to getting this poster by paying for it by stamps?
Yeah, aren't those the kind of shoes they use for Irish step dancing? What are they called...ghillies?
haha i couldn'tve said it better

love the sucking in the gut too, nice touch
It's funny. Compare the picture here, where he's obviously well-endowed, to the one on the website, where he looks smooth as a Ken doll.

I wonder which one is retouched? I'm betting on the smooth one.