In the musical I've been writing with my collaborator the mother and father are going to a dress-up dinner at the beginning. However during the course of the story, the mother's dress gets torn. I was originally thinking that we'd need two identical formal dresses, one intact and the other needing repair, but my ever-creative collaborator said there's an easier way. Start off with the torn dress and have it invisibly 'mended' in some way at the beginning of the play.
I'm not sure why this is something I should be trying to micro-manage...in due course the costume people will deal with it, but I think I like to at least know about how these things are going to work. My collaborator is the same: even though we've sorted the script out, she wants to go through it and work out when scenery can be set, when it can be dispensed with, when tabs (inner curtains) close, when they open...and much more. In fact, if it seems like I'm a micro-manager, you should meet her! :)
And we still have to figure out how to fly some characters off the stage in one of the later scenes. It's going to be interesting.