simplicity sake, tees with jean be more than enough for the average "friend friend, some some unknown fellas audience" kinda gig.
For paid gig, talk to bandmates, whether wanna have a uniform image or you do your own i wear mine kinda.
Anyway, why some of us flame here, not because we are nasty, but more of "isnt it obvious"
In term of dress sense in a band, its either we dressed to reflect our own music preference(rock tees, jeans, sneaker etc) or as a whole sale band image with uniform colour attire through out the band or simiply, dressed what we like and play a freaking solid set to impress the crowd.
Of course, if the band other than doing music, has a image side of things, then go over the top lah.