Place one cake layer onto the cake board
Scoop about 1 C of black frosting onto the first cake layer and spread evenly
Place the second cake layer on top of the first layer of frosting
Scoop another C of frosting on top of the second layer of cake and spread evenly
Place the last cake layer on top
Using the remaining black frosting frost entire cake and smooth frosting
Place into the fridge for several hours
Decorating the cake
Cut the tips off the four disposable piping bags
Using the black piping bag, pipe out the lines of Sally's dress
Take the Pink frosting and fill in a few of the squares or rectangles
Take the teal frosting and fill in a few of the squares or rectangles
Repeat the steps with the yellow and black frosting
Using the remaining the black frosting, pipe out the details of the dress
Place into the fridge again to allow the frosting to harden up
Cut into the slices and enjoy!