Levi's 1999 Engineered Cinch Back Twisted Jeans Introduced in 1999 under designer Rikke Korff, Levi's Engineered Jeans represented a radical reimagining of traditional five-pocket denim. The design prioritized freedom of movement through ergonomic darting, engineered side seams that twist around the leg, and asymmetric pocketing. Drawing functional inspiration from pre-war workwear while embracing late-1990s industrial design, the line featured distinctive heritage details like the cinch back buckle. These first-generation releases have transitioned into highly collectible archival pieces representing turn-of-the-millennium denim innovation.