Below are the sizing guidelines for men's apparel as outlined by Matte Grey.
Small (135-155lbs) - fits similar to a European cut but with a more Americanized look.
Medium (160-180lbs) - fits the more built yet lean physique.
Large (185-205lbs) - fits right on spec with original patterns but with more updated styling.
X-Large (210-230lbs) - fits the more athletically-built individual with added room for comfort.
2X-Large (235-255lbs) - fits similar to the full-bodied brands but with cleaner lines for sharper aesthetic.