Mmmmmm, what a delicious idea.
There's so many costume choices for a domme:
Cop / Police Officer,
Super Heroines like Xena, Wonder Woman, and Super Girl to name a few,
Cowgirl,
Cheerleader,
School girl,
Slave girl,
Secretary,
Female Boss in Exec attire,
Pirate,
Greek Goddess,
Cleopatra,
Angel or Devil,
Goth
or whatever your heart desires.
....
Yes, even the innocent ones often associated with subbing can be quite fun to wear while domming our sweet pets.
My pet, Nathaniel, recommends getting ahold of the Ilsa She-Wolf series if you are into women in uniform.
http://en.wikipedia.org/wiki/Ilsa:_She-Wolf_of_the_SS
Have fun,
Ruby