1 day in advance, make drop flowers using royal icing. Cover cake board with waxed paper. Use tip 2D and pipe approximately 30 drop flowers with tip 3 dot centers in white royal icing. Make extras to allow for breakage and let dry.
Bake and cool 2-layer and 1-layer cake tiers to make 5 in. high cake. Ice in light pink buttercream icing. Attach drop flowers to cake with dots of icing. Connect flowers with strings of tip 3 dots in white buttercream icing. Add tip 18 shell bottom border in white buttercream.