I have a friend who did an encore in a big canvas Shark costume !
Very Silly !!! Mind you he had a lot of professional gigs under his belt and the show had just gone out live on BBC Radio !

Me, I'd think comfort and practical rather than "looks stunning".

Shades look cool but if they stop you from seeing what you are doing and cause you to trip over the bass player, thats bad !!!

I once plaid a gig where our bass player trampled all the pyroes before they were set off. That was bad !

Are you going to jump about a lot ?

If so cowboy boots are not a good idea and sneakers or baseball boots are very good.

Remember any fool can dress up in a Tutu and Mickey mouse ears (ever see the Cheech and Chong film with the battle of the bands ?) however IMHO it is better to play well and come off as being professional (like not screwing about between songs, not drawing your set out too long, not getting pissed before going on stage etc ).