1917 Usn Denim Work Pants Are Little-Known Early Usn Work Clothes, Even In Magazines, Are Few Items. This 1St Generation Usn Denim Jeans Continues The Characteristics Of European Work Pants: V-Shaped Split At The Back And Buckle Back. The Hip Has Only One Sticker Pocket, Not The Symmetrical Double Pocket That Became Popular Later; Wide Legs, Easy To Move Around.