When I shear one of my sheep, I put her on a shearing stand with her head in a stanchion. This setup keeps the front end of the sheep fairly steady, but the rear end can pivot all over the place, and, believe me, it does.
I looked online and saw some hobbles for goats. They were made from nylon webbing, closed with Velcro, and were adjustable. They appeared fairly simple. I figured I’d make a pair to try out the idea. If they worked, I’d make a better pair or order some.
I’m glad I experimented with my cheap version first. NEVER mix Velcro with sheep – and their wool. Use your imagination for the rest!