I've added stripes of fondant directly onto Ganache before with no problems at all, just used a smear of piping gel to attach 
AI did this one...[IMG ALT="I made this cake for myself! I love the way the colors turned out, and it's only my second try at making flowers."]http://cakecentral.com/content/type/61/id/3234198/width/350/height/700[/IMG]
By adding the stripes direct onto the ganache. I actually turned the cake upside down to do it, which made it easier for me to get a straight top edge.
I don't know how well this works as I have never done it myself but I have seen people give advice about freezing the fondant for a few minutes so that the fondant is firmer and less likely to stretch out of shape when you apply it.
AIf possible use modeling chocolate it doesn't stretch like fondant will.
Jessica Harris has incredible tutorials on Craftsy for this type of design. She uses a wax paper method that works really well for horizontal stripes.
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