I looks like you could do strips of fondant over lapping each other? Starting from the bottom and working your way up. Lovely cake!
What alvarezmom said.
Yep, I've done that cake three times. It's ribbons of fondant, and ribbons of fondant , and ribbons, and ribbons . . .
is the flare out on the ribbons just caused by the layer underneath. it almost seemed to be thinned out like with a ball tool and I was really hoping not to have to do that.
I see what your saying mandirombold. It could be because of the fondant that would be undearneath each new "layer". You could get away weith not having to use the ball tool.
I have two cakes in my album (on the first page) that have this same layering although not done on every tier like your example. I did not have to use a ball tool. The ribbon of fondant just naturally sticks out a bit because of the layer of fondant underneath. The hardest part is the tops of the cakes when you have to cover it, have it hang over and cut a straight line (unless you don't put fondant on the tops and leave the buttercream show...could be far less work ).
Good luck with it. It's a beautfiul cake. Make sure you post your finished product.