This jacket has some serious wear and one sleeve is missing below the elbow Could it be a theatre alteration for an airman who lost his lower arm. Seriously the jacket might be good for parts.
http://cgi.ebay.co.uk/VINTAGE-WWII-USSA ... 0375136302
http://cgi.ebay.co.uk/VINTAGE-WWII-USSA ... 0375136302