Dressing up for my girlfriend?

I told my girlfriend that if she ped this big test she had coming up that I would let her dress me up, and I would do whatever she said. Well she ped and I'm a man of my word so I'm going to do it. She's narrowed it down to 3 things. Dorothy from the Wizard of Oz, Glinda from the wizard of oz, or a ballerina tutu and everything. She said that she wants you all to pick which of these I have to dress up as and what I have to do while I'm dressed as this. Please help her out. She did a good job on that test and she deserves it. Thanks.