DIY all you want. I'll stick with ready made. But I'll strongly advice against nylon webbing for calf enclosure using these hooks. The elastic they used was there for a reason making the original suits, IE you need the material to flex when you pull the hooks out of the holes. Also, your "finished" strap has no pull tab, so you will have a lot of trouble grabbing it to get it out with your leg stuck inside.
Sorry to sound so pessimistic. You've done a nice job of bending the wire. It looks really neat. But you are re-inventing the wheel.