K.V.
Maybe you could do big blocks of color. Do the bodice in one color and make the skirt with a wide stripe(2/3rds) in one of the colors and the other 1/3 of the skirt in the other color. Then you have the neopolitan stripes. the shoes could match the bottom layer's color.
Or, you could do the bodice one color and the skirt another, and put pockets or a sash on it in the third color.
If you want an ice cream cone hat, maybe you could get a wizard hat pattern at joann or somewhere (harry potter patterns maybe) and just use the colors that you have instead of what they recommend.