Zip ties work great. In fact this product:
http://www.connectingthreads.com/cft...paign=PPCgpGen
Is really nothing more than heat resistant zip ties (also called cable ties or wire ties) in various widths with the locking part cut off. Most zip ties are made to withstand the heat because they are used to tie bundles of wiring near engine motors (Especially if you go to an auto parts store for them.) But I don't iron over them. I just use them to turn the bias tube so the seam ends up on the bottom. I press the tube as I slide it off of the zip tie.