Originally Posted by daniellam

They'll probably just hand each person a "paper underwear" and ask that they wear it before going in. At hotels in Asia, it is quite common for spa staff to ask the guest to put on on the paper underwear before going in for a massage. Although the paper underwear doesn't do much (it's usually of poor quality and you can still see through it), asking the guest to use it at least manages their expectation as to what is allowed and what isn't.