This is always discussed in planning meetings, but typically a suit. I feel that I should blend in and wear what I would if I were a guest. Wearing a tux would make me look like part of the wedding party, wearing a vest would make me look like a waiter and wearing a polo really make me stand out as dressing too casual in most weddings.
Scott, you and I know each other well enough I think -- so I'm gonna address your post, although it's really to the board in general. Hope you don't mind me singling your quote out, as that's not my intention -- you just happened to have the last post before I got wound up...
You people are entertainers, or at least you call yourselves that. Yer not waiters at the beck and call of a table.
Your job is to entertain people, and not be a human jukebox. Where has that whole aspect gone...?
Would you tell Elvis or MJ how to dress? Hell no!
If you are truly there to entertain, then whatever you wear, and whatever you play, is YOUR decision. It's what makes you comfortable, what builds your brand, and what keeps people calling you.
IMHO, if you can't define yourself, then you are not worthy of entertainer status -- yer just hired help, might just as well be slinging burgers at Mickey D's. I walked away from that corporate/government world long ago, and will never go back. There's no money in the world, worth losing your self-identity, and what you want to be.
People will pay you huge dollars, if yer willing to be who you are, and are good at what you do. All you have to do, is be yourself, and entertain those that are still wearing the suits and ties...