I just learned how to do a bed bath today, it was a crash course but none of us were naked by any means!!!! We all were allowed to wear shorts and a tshirt, the teaching part didn't include water...thankfully the darn room is like an ice box. But the check off will be with water...i gotta practice more, i dropped my bucket twice and was thankful I wasn't using water yet. LOL I would personally, tell you instructor you feel uncomfortable about being so exposed to your classmates or I would tell the director of the department. If at any point you feel uncomfortable, stop, think, and then realize there is always another way of doing this.