I purchased these recently from a dealer who represented this as WW2 HBT 2nd Pattern Camo trousers. The trousers appear to have the HBT weave in the cotton material, the camo pattern is only printed on one side of the trousers, there are no labels of any kind inside or in the pockets or stampings, there are five metal tack on buttons with the 13 stars that were first used during WW2, the buttons are located one in the front, two on the pleated cargo pockets, and two in the back to adjust the waist. The trousers do not have any pockets except the cargo pockets like 2nd pattern HBT and this not a button fly, but has a zipper. The zipper is made by Waldes Made In USA (marked). The zipper is brass in color with tan colored material. The back of the trousers appear to have been taken in because they were two big for the previous owner. I have not seen any 2nd pattern HBTs in camo or with a zipper so I am thinking these are WW2, but possibly Vietnam War era ARVN advisor King Kard pattern or duck hunter pattern camo trousers or was this a WW2 US Army jungle coverall suit that has been cut down and made into pants. I have no history from the dealer other than this was obtained from a vet's estate who served from WW2 to the mid-1970s in the US Army. Let me know what you think.