This JD4 blazer is made with with a relatively lightweight fabric, the JD4 blazer is a refreshing take on the standard plain navy.  Slim fit Notch lapel Double button fastening  Single back vent 80% Polyester 17% Viscose  3% Elastane  Dry clean only  Model is wearing size 40, his usual size is a 40 Slim fitting item across body and shoulders Select larger size if you prefer clothing less fitted