I just went and got my wonder mold and my 8" pan sits right on it and is only a 1/4" off. So I would go with 8" pans. I did one for my daughter and she still raves about that cake. I put a real Barbie in it, instead of the 'barbie' pick. I found one of the fairy ones with removable wings, she worked perfect because her bodice was already molded onto her torso. Don't forget to wrap her legs in plastic wrap to make clean up easier. Good luck!
Hi I made a few cakes some carved with 3 8" or 4 8" and you can do 1 9" for the bottom depending on how tall you want it so either 3-4 8" or 3 8" 1 9". About 3-4 single layer cakes. Then place the barbie in a plastic baggie or Saran wrap waist down make a hole in the top of the cake where the barbie will be. then start from the top and work your way down carving like a dress shape. You can use your scraps to make the waves. Frost the skirt first then use the scraps for the rolls then frost over them. You can use fondant or what ever you like to frost. Then decorate. Remember to put the dolls hair up so it won't get full of frosting. Hope this helps. Have fun..... 
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