The Upright Citizens Brigade believes that new, unproven ensembles should dress in a manner comparable to “business casual.” This will lend an air of professionalism to your show.
In a practical sense, it is important that you always dress so that you are ready to perform. If you are wearing a pair of pants that you’re afraid of getting dirty onstage… [or] wearing a miniskirt that is liable to show off more than you want in certain positions, you may be unwilling to make physical choices that would best serve your scenes. Since you are going to want to be free of restraint, dress to be active. Dress to play. [UCB Manual, pp. 380-381]
To me, “business casual” and “dress to be active” are mutually exclusive. That’s why workout clothes don’t in any way resemble work clothes. I always err on the side of “dress to be active” (and as such, I dress like a slob for my office job, too).
Blazers constrict your arms, button-front shirts can gape, fancy shoes deter you from jumping and editing, ladylike blouses are prone to every kind of reveal, long sleeves in general are too hot for the stage. And so I always come back to a men’s t-shirt, loose jeans, and running shoes. I look like a 14-year-old boy. But at least I can move.
Is there an upscale designer business casual t-shirt out there I should look into, one that doesn’t have a tuxedo printed on it? What do you wear to perform?