What does it look like now and how is it being worn ?
I'd probably not use half-circles but just one big circle and use stitching around the edge to gather it in.
The "twisted" portion might need to be bigger, I could see that being one of the issues but hard to say without a photograph !
Disclaimer : This post written by a Grumpy Old Man
Actually in the pipes:
- Remaking Ser Loras doublet.
- Luke Skywalker, A New Hope
- Wind Waker starter costume in swim material
Eventually: Paul from Dune, Faramir, Harry Sullivan