Yeah.. I definitely go for the boyish look myself, short hair, t-shirts and jeans, etc. Doesn't mean I'm not submissive -- I just need to be dominated by someone who doesn't need a lot of fancy decorations to prove he/she's in charge.
On the other hand, if my Dom requested that I wear something particular for the occasion, I might enjoy obliging him. Dress-up can be a fun part of role-play for me, as long as it isn't all the time.