I've been asked to make a bag cake like the Tiffany bag (when you make a purchase). But I was wondering size I would need to make to feed 60 people. Can anyone help me figure out what size I would need to make the cake?

TIA

I am in the process of making Sharon Zambito's purse cake and it is a 14x14 inches with 4 layers. I am thinking that would feed around that. I am also going to make matching mini cakes to make up the difference. HTH