Tell her you want one for every day of the week!
My girlfriend bought me panties and is telling me to wear them for the rest of the week, should i?
Okay, did you wear panties for the rest of the week as your girlfriend wanted?
Well I wouldn't wear the same pair for a whole week.. It wouldn't be very hygenic .
Panties? Like like underwear? Like boxers?
Wear them and don't as questions she will love you for it