Interesting Willis and Geiger Cloth M422A type jacket on USMF Real?

I thought I would bring this jacket to the attention of the gurus here on VLJ

the owner says it's a seal brown cloth with Alpaca lining, a vintage looking crown zipper and apparently original W&G lables

Is this some type or prototype or a postwar jacket?

http://www.usmilitariaforum.com/for...-willis-geiger-flight-jacket-b10nylon-hybrid/...

Interesting Willis and Geiger Cloth M422A type jacket on USMF Real?