I'm sure all of you love Coach scarves as much as I do. I know they're made of 100% silk, unlike a lot of other brands, but this is presenting a problem for me-- when I try to use one of the ponytail scarves as a headband, tying the knot at the back of the base of my head, it just slips off! What do you guys do to keep it on your head? I know there's a thread up about cutting them up and making headbands but I'd really rather just keep my pretty scarves whole-- any tips or tricks? Where do I put bobbi pins where they will stay hidden but be effective? Would hairspray, roughening up my hair, help? Pictures, anyone? Thanks!