In 1901 a second back pocket was added to the 501. This is a exact replica of the 1901 501 denim pant. It's made of 10oz plain selvage denim with exposed rivets on the back pockets and crotch, suspender buttons, cinch back, button fly and an irregular hand stitched single needle stitching on the back pockets. Measurements before soak Waist: 44,0 cm Thighs: 32,0 cm Front rise: 36,0 cm Inseam: 86,0 cm Hem: 22,5 cm Length: 115,0 cm Measurements after soak (1 hour in warm water): Waist: 43,0 cm Thighs: 32,0 cm Front rise: 33,0 cm Inseam: 84,0 cm Hem: 22,0 cm Length: 112,5 cm The color didn't change much after the soak.