ShariRoseNon-slip head-band wig grip adjustable headband for under headscarves ShariRose (Black velvet)

How long is it? I have a big skull.

Would this work for a bald woman who wants to wear a scarf on her head? Maybe a slippery scarf, like satin or silk? Thanks!

I have bought a similar style by another designer and theirs stretched out on me. Does this one stretch out?

Are these headbands vegan? (Do they contain silk or any other animal-derived products?) Thank you!