I have a small 4 tier cake in May with butter cream icing but she wants a fondant swag cascading from side to side of each cake down the front of cake how do I assemble the swag to the cake ,does fondant stick to butter cream icing ? Any help will be appreciated!!!! 
Heres some tips that may help:
A) make sure you dont roll the swag too thin (it needs to keep its shape) and not too thick (that way it wont slide off the cake).
B) I've found that using extra buttercream to stick fondant to the crusting buttercream (if thats what you are using - and I would suggest you do) will spell disaster. I personally have found that if you use piping gel it is light enough that it wont pull the fondant (dont use too much).
C) use wadded up small pieces of plastic wrap to keep its shape if you think that a fold may fall while it is drying esp overnight (dont use cotton balls - I find that it sticks to the fondant and you will be picking cotton fibers out of folds) (don't stick in the fridge). Plain old plastic wrap wont stick to the fondant.
D) you " could" try adding 1 part fondant to 1 part gum paste (kneaded together well) that will help it to keep the swag shape. Personally, I like to just use fondant and the plastic wrap method (its whatever you like and feel comfortable with).
E) Practice with a rectangle shape.
F) Feel a little unsure? Practice with a couple of cake pans turned upside down till you get your "drape technique" in your swag the way you want it.
need a few more tips? - I have a few others if needed.
I would really recommend mixing the fondant with some gumpaste or adding some tylose powder to the fondant. It will allow you to roll it thinner and lower your risk of tearing. This is also beneficial so you have less weight to pull your buttercream down and will give you a more realisitic looking drape.
Thank you ,youve been great help!!!! Quote by @%username% on %date%
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