Let Loose. Rex is made in our vintage washed cotton twill. This easy pull-on pant has an adjustable drawstring waist, side stripe, and side seam pockets.. Fabric: Doheny Cotton Twill | 100% Cotton. Care: Machine wash cold, gentle cycle, tumble dry low. Fit: True to size. Model is 5'7.5" and wears size Small. Inseam: 26 in.. Made in Los Angeles. Style Number: X387708