Quarter sheet (9x13) one layer. 
Three tier wedding cake: Tier 1 is 10 inches Tier 2 is 8 inches Tier 3 is 6 inches Two layers for each tier 
Two tier wedding cake. Two layers for each tier. Bottom tier is 8 inches top-tier is 6 inches.
Most of the winter cakes have been the naked cake. It is a 6 inch two layer cake with minimal design.