I don't know what sizes to use or even how to do it.

It is the bottom one.

http://www.romance-fire.com/2008/05/18/32-ways-on-choosing-your-perfect-wedding-cake/

Hi!

I am no professional but from my take it looks like a 10", 8" and 6" which have been carved to that shape. Fondant has been applied to each tier, then fondant strips cut and applied for the stripped look.

I am sure the more experienced members on this board will jump in and help you out with the finer points. Good luck, very cute cake!

Duplicate post.

Nicole got it right

i second (or is it foutrth that??lol) but i would like to add that they look like they are either double barrel tiers or very high baked tiers of like 6" high