Do you have to be undressed during a full body massage?

You don't have to completely undress but most people I talk to do. Do what is comfortable for you. Some just leave their underwear on but then you can get the body oils on them around the edges. I prefer to completely undress. The massage therapists I've been to, male or female, have always draped carefully. But also I often need my glutes worked on due to sitting at a desk all day so I really need to completely undress for that.