ALL Zippers working properly.  Classification: Authentic World War II US Army "Second Pattern" Winter Combat / Tanker Bib Overalls.Historical Era: Produced circa 1942–1945 for armored crews, tank personnel, and motorized infantry.Primary Material: Heavy khaki/tan cotton-twill sateen outer shell lined with dark olive-drab insulating blanket wool.Main Zipper: Vintage silver-toned Talon open-bell pull tab featuring a period-correct block font.Side/Pocket Closures: Asymmetrical pocket layout using premium brass sliders and secondary Talon bell zippers.Special Pocket Feature: Functional dual-pocket system containing an unlined "reach-through" pass-through slot for instant under-layer uniform pocket access inside vehicles.Ancillary Hardware: Heavy-duty pressed metal "13-Star" button snaps representing the original 13 American colonies.Issued Marking: Stenciled military field laundry code reading XK-2048, where the "X" serves as an Army quartermaster administrative placeholder for "Pooled/Unassigned Property."Personal Marking: Custom red-and-white hand-stitched uniform identifier reading H 24, added by a soldier to easily reclaim gear in group field laundries.