I really like this idea but I'd do it with a different activity, and it'd have to be done right and in a way where it doesn't mess up the power dynamic.

My main fetish is CWNM and the powertrip it brings me. I absolutely love when a sub begs for something, offers a very generous incentive (whether it be $, labor, etc), and still gets denied by me. There's no greater power than the power to say "no." No is my favorite word hahaha. So my personal answer would be "none".

Of course, everyone gets their fun from different activities. If a Mistress enjoys taking their clothes off they should do whatever they like