Originally Posted by lawyerdad
Well, some might think that if the customer wishes to try on pants, it's relevant whether they are wearing one or the other - even if it doesn't matter which.
It's probably relevant whether they are wearing underwear -- I would think you would assume that to be the case, though it may well not be. It would be rude to ask whether they are wearing underwear because the common presumption is that any reasonable facsimile of a gentleman would be, particularly if he expects to try on a pair of pants in a shop. Whereas it's quite common and acceptable for a man not to wear an undershirt, so it's hardly rude to ask whether someone is wearing one when he makes a request to try on a shirt that someone other customer may wish to try on or buy in the future. It's certainly far more polite to insist that everyone wear an undershirt than to try to assess on an individual basis whether a particular person or another exceeds the acceptable threshold of moisture.