craftgrrl | protective clothing for art activities?

hey everyone,

i'm making a curriculum right now for preschoolers that revolves around some fairly messy art/craft projects. while i know it would be easy to go out and buy some smocks, i was thinking of making some "protective clothing" that would be easy to make and relatively easy to clean up. and when i'm saying "relatively easy to clean up", i mean just wiping it down with a wet cloth, not starting a load of laundry. the only thought that came to mind was throwing a garbage bag over the children and telling them to go nuts, but i don't know how well that will go over! (kids don't really care, but their parents do.)

any ideas would be greatly appreciated.