im assuming alice in wonderland since that seems to be the new fad now...
there are lots of costume patterns out there, just go to the store and check. im sure there is even an alice in wonderland costume pattern out there. lol
Simplicity 4015 works like zaida suggested.
or McCall's M4948 costume pattern. her outfit is very simple and easy to make. puff sleeves, peterpan collar, and an apron. add a tulle underneath to make it puffy.

