I gathered speaking with the guys at Langlitz was feedback from customers who order cowhide expecting the drape and feel of goatskin when the jacket arrives. If you go to the shop the jackets primarily available to try on are goat, which is fantastic but far more supple intially than cow or horsehide. That being said I am choosing medium weight cowhide again for my upcoming Langlitz flight jacket.
Yeah, probably best to just talk to them. I already had them on the phone once and they were very friendly and helpful