Henry David Clothiers 100% Wool Dark Green Blazer Men's Size 44? Green Patches

Henry David Clothiers (Henry James) 100% Wool Dark Green Blazer Men's Size 44? Green Patches Excellent condition, with no stains or flaws noted. Minimal signs of wear. There's a piece that goes under collar? It's buttoned on one side, not sure what it attaches to, or if button missing where it should attach other end (last picture). Please see measurements as this was a custom made piece, and actual size not indicated. Length 37" Pit to Pit 23" Pit to Cuff 18' Please see pics to verify details! Ships fast from smoke free home :)