I just had a request for several of these...I used Fabric-Tac glue and it worked well. I tried it with hot glue, but got too many lumps. I also made sure I did it very slow, like three inches, then three more inches, etc, if this makes sense! I was pleased with them (and so was the customer, thankfully, lol!)
I'm going to try the double-sided tape!
Dove Designs Hairbows and More http://www.etsy.com/shop/sowega