From Ervell's S/S '14 sample sale. Black, 100% cotton, made in New York. More information per the website listing:
Extension tab at waist with hook and loop closure for a minimal and refined look. Tailored for a close fit, slim but not tight through the thigh and tapered below the knee. Button closure with zip fly. Constructed with up to 2" to let out or taken in in the seat or waistband to allow for easy tailoring.