I like super stretchy bands, mimimomo, a member here sells some bands and clips at her online store very reasonably priced.
toplinepet.com I use the black ones in the tube, I know they are stretchy. Joey's breeder told me that when you put a topknot in you should always put something between the band and the scalp to loosen the knot. Too tight of knot, meaning too close to the scalp, can damage the hair follicles and in some cases she's seen the scalp go black where the tissue has died. With these bands you don't have to worry, but they stay in good too unlike the cloth bands.