Theory Slim Cargo Pant in Rust. - size XS (also in L, M, S) Theory Slim Cargo Pant in Rust. - size XS (also in L, M, S) 100% triacetate. Made in China. Dry clean only. Elastic waistband and cuffs. 4-pocket design. Lightweight twill fabric. 18 at the knee narrows to 12 at the leg opening. THEO-WP250. L0209213. Theory is a visionary concept for modern intelligent fashion forward people. Founded in New York and made by the finest of fabrics, this makes the working everyday person feel powerful, ready to face their day.