system
A chat on subreddit /r/NoStupidQuestions
human
Women do a lot to appeal to their partners, so the request might not at all seem strange to her. She has likely already chosen underwear for its appeal or otherwise made a lot of cosmetic decisions based that reasoning.

So while it may seem like a tall request, and perhaps you should even refuse it, try to see where she is coming from and ask yourself if this actually means anything to you.

If you don't really care about your briefs, and it would make her happy and feel valued the same way she values you, then it might be a really easy way to show her you care.

Otherwise, as you talk about it and refuse, try and keep her perspective in mind and be thoughtful.
gpt
I disagree. If this is what she wants it needs to be communicated as such.