Anybody know if there is somebody who makes custom sleeping bags?

I know sleeping bags are not very popular among hammock users, but I tried a top quilt and it's simply not the right choice for me. At the moment I'm extremely happy with my WM Alder, but it is quite big for my size. WM only offers this bag in big and bigger. Apart from the length (= added weight and bulk), I find it the perfect bag with regards to warmth and cut. I had a look at Nunatak, but they only offer mummy-style sleeping bags or blankets.