Explosive charges might not be a good idea.
Actors should never be allowed to take costume gear off set. You don’t have to keep their clothes hostage, but it can help.
For Flesh Of My Flesh, I had a bin for each main actor. In that bin was all of their costumery and gear. I’d send ‘em into the bathroom or changing room with the bin, and tell them to put all their kit into the bin and come out in their set kit and gear.
That way, all their personal kit didn’t get lost, and there was a clear swapping action.
Slow, but effective…
