Polyester Business jacket for boys.
More like a suit jacket than a traditional school blazer.
Size Guide
If you normally buy by age the following may help.
Chest 28” usually fits age 9/10
Chest 30" usually fits age 10/11.
Chest 32" usually fits 11/12.
Chest 34" usually fits 12/13 etc.
Sizing is for guidance only.