HI: I am not an expert by any means....but, it looks as though they cut large strips of fondant and just draped them over the cake loosely..Good luck
PS. very pretty cake
It looks like the ones from baking arts, Chocolate modeling paste draping. They literally wrap the cake.
Here are some more -
Yup, I would drape pieces over tucking in the edges so it looks like one piece.
Looks like you cut a piece of fondant like a rectangle turn the edges over so they would be on the inside then drape on the cake. Good luck, looks a lovely cake
Thank you everyone for the tips!!