M.W.
Just a thought....... IF your girls are into the princesses at all, you may want to consider getting them princess dresses instead. MOST of the little girls at DisneyWorld are dressed as a princess. We did see a couple Minnie Mouse ones but very few........ Our daughter dressed as Cinderella! We had an aunt make her dress and a local seamstress make a cape and we got a TON of compliments. (Probably 25+ a day, each day she wore them....)
Even Toys R Us has pretty decent princess costumes for about $25 a piece.
Our daughter was very comfortable and she just wore white tennis shoes with her dress so she could walk decent!