Original WW2 US Marine Corps P41 Jacket Size 44 USMC in Belts Original Named WWII USMC P41 HBT Utility Jacket Shirt UNIS Artillery WW2 USMC HBT P41 Jacket Repro Shopee Philippines ID'd ww2 usmc p41 jacket. The P41 USMC Jacket reinterprets the iconic U. S. Marine Corps utility jacket through Spiewak?? s refined military heritage lens. Crafted from authentic cotton back sateen, the fabric offers lasting durability with a soft yet structured hand, developing rich, vintage inspired fading and wear patterns over time.