Crewcuts J Crew Boy's Blue Wool Thompson Blazer Jacket Brass Buttons - Size 10. Blazer is super stylish with a classic look and style. Two brass buttons up the front and 4 matching cuff buttons. Blazer is made out of 100% wool. Arms measure 19.5 inches in length (measuring from shoulder seam to the end of the sleeve) and the jacket measures 14 inches across from shoulder seam to shoulder seam. Jacket measures 23.5 inches in length. Middle back vent.