I saw several. The BDSM Pony thing in the corsage, the Latex Doberman (at the dance, and otherwhere), and some guys in full bdsm gear at a room party (which is absolutely fine, given the fact that these things are private; albeit they had their doors invitingly open); some reptile dude in spandex (technically, it had vinyl [??] components and other skintight material; but the guy was actually moving elegantly and not in a pornographic manner, so he was very fine).
... Yeah, spandex is mostly okay (in my eyes!); latex or vinyl as the main components of a costume isn't. I don't mind people doing it, but it pretty much clashes with the healthy "weird but friendly" image the furry fandom is trying to build up. Outsiders are just way too prejudiced against these kinds of suits to make it worth risking making headline news in them.