I'm a general contractor, and all employees of ours, and of our subcontractors, are expected to arrive for work with all of their tools and all OSHA- and Company-Required clothing on.
As discussed earlier, it seems as though Disney realized a while back that they could require this of Cast if they let them take their costumes home.
Entertainment cast is a completely different story. They can't take anything home (except for their personal spanks, tights, etc), and clock in before heading to make-up, hair and wardrobe.