fitone saidI've seen a number of guys wearing house shoes in the gym. It looks ridiculous to me. I think one needs a bit of support for the feet when lifting weights. I've also seen trainers wearing flip flops. One of them dropped a weight on his foot, limped around for a few weeks, and continues to wear them. Does anyone think this looks cool?
When we do olympic lifts at my crossfit gym, our trainers make us remove our shoes unless we're wearing really flat-soled shoes (eg. Chucks). I'm not exactly sure why, but I do feel that my stance is noticeably more stable when just wearing my socks or I'm wearing my vibram five fingers. My trainers sometimes workout in flip flops too.
(It should be noted that I'm a barefoot/minimalist shoe runner as well, which might explain why I'm more comfortable working out without my shoes.)
Honestly, I could not care less if it looks cool or not. When I'm working out, I'm there to impress myself, and myself only. To hell with what anyone else thinks. If wearing a pink tootoo somehow magically lets me deadlift a few more kilograms of weight, I sure as hell will wear it.