To ask (only) if the costumer might go shopping, isn't a bad one, but asking the actors to choose their personal clothes to wear is. (except for readings and such...which is how the costumes for the current Chicago revival were conceived -- if I'm remembering correctly.)
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.