A smooth, structured broadcloth-weight fabric with a slight stretch, fitted close enough to require good recovery so the tapered leg doesn't bag out at the knee with wear. Machine wash cold on a gentle cycle and hang dry; avoid high heat, which can relax the stretch and loosen the fitted taper. Because the fit is close through the hip and thigh, washing inside out helps protect the outer surface from pilling against zips or rougher fabrics, and the fitted line should hold consistently across washes as long as high heat is avoided.