Hey! That's me!
I think you guys commenting on that pic make a very important point - you've got to think about what works for YOUR body type and persona. What looks good on a big guy may not on a smaller one, and so on. Similarly, I've seen guys who will dress up in some flamboyant getup like they're Elton John, then just stand there on stage hunched over and not doing anything. They would have been better off wearing stage blacks and not drawing attention to themselves if there wasn't going to be any activity to pay attention to.
The thing about wearing jackets and comfort and all really depends on your tolerances (and the actual temperature). I've had times I've worn one and been perfectly comfortable, times I've stuck it out and just let myself sweat (sweat can also be a rock and roll stage look...), times I've taken a jacket off after the first set, and times I've done without altogether. It just depends.
Two things I would suggest paying attention to - SHOES and ACCESSORIES. For a long gig on stage, you want your feet to be comfortable. But again, know your tolerances, but even subliminally people (especially women) will pick up on a sense of stage presence rooted in whether the shoes are just your comfy day to day sneaks or if you've got something a little zingy on your feet. I most often gig in a pair of Beatle boots, but I've also done clompy Doc Martens or wrestling shoes, etc. As for accessories, small touches of flair can help avoid the "waiter" look if you're otherwise in black and white and wearing a vest or something. A necklace or choker, wristband, things like that.
The outfit in that picture was for the Blues Brothers tribute band I'm in. Some others, for more regular cover band gigs:
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