So silky, how will it stay in my hair?

I've been working on this little headband on and off for a few weeks now. Obviously not major knitting, and I don't need to think very hard while working on this. The Simple Lace Headband is a good pattern, though I need to figure out how long this little thing is supposed to be.

The only complaint, which is my fault, is that the silk won't stay put on my head. I'm going to use a few strategically placed bobby pins to keep the damn thing on. I do love that this is using up what little yardage of the silk I had left over from my silk-and-mohair Edgar ... and the color pops against my dark hair.