Jersey Number This authentic jersey will have the number 20 on it. This is the number worn by Lou Brock with the 1979 St. Louis Cardinals. Quality Construction Authentic Materials. Accurate detailing. Exceptional workmanship. These are the hallmarks of Mitchell and Ness's shirts, jackets, sweaters and felt pennants. The wool flannel shirts are constructed of a lightweight wool blend predominant in the late 60's. The 70's and 80's knit jerseys are made of fabrics identical to the originals. Sleeve length is measured from top of armhole to bottom of sleeve. Size Body Length Body Width Sleeve Length 40 M 31' 21' 8.5' 4446 L 32' 23' 9' 48 XL 33' 25' 9.5' 52 2XL 34' 27' 10' 56 3XL 35' 29' 10.5' 60 4XL 36' 31' 11' 64 5XL 37' 33' 11.5' Please note that measurements are approximate. Mitchell and Ness Clearance Sale Browse our Mitchell and Ness Clearance Sale and get 30 50%off select Mit