Yes they do, quite often you cannot return them, so you want to try them on before buying. Alot of the lingerie stores offer free bra fittings, you might want to try that. Apparently at least 80% of women wear an incorrect bra size, so a fitting might be something to consider.
if they sell bras and have a changing room/fitting room then yes, bras are just like clothing and your allowed to try them on
Yeah, it's just like traying on clothes.
Not the store I went to...
if they have a dressing room !
Yes they do