Doll Cake Buttercream Swirl Dress

Hey everyone, here is my latest Doll cake, she turned out so pretty, I hope you got an idea on how to put her hardest part has to be when you have to cut the cake to sculpt the dress, one bad cut you re screwed can t have a lopsided dress used an Ateco 868 star is a very large tip will require a large piping bag, I believe I used a 20in bag, I went through 1 1, 2 of that piping bag full of buttercream to completely cover the can use a small bag like a 1416in ba