From Year 5. SMSJ boys blazer with braiding and embroidered school logo. Suit style pockets Single back vent Recycled outer blazer fabric Stain resistant Fully lined 40 degree wash 100% Polyester What’s my size? Blazer fitting guide Blazers are bought by chest size, so you will need your child’s chest measurement to start. To take your child’s chest measurement, measure around the fullest part of their chest. For younger children, place the tape measure a few inches below their armpit and measure their chest there. For older children, particularly girls, the fullest part of their chest might be a little lower. Your child will be able to tell you what feels comfortable to them. Be sure not to pull the tape measure too tight as this can lead to buying shirts or blouses which are too small and strain at the buttons. CHEST SIZE 26″ 66cm 7/8 years 28″ 71cm 9/10 years 29″ 73cm 9/10 years 30″ 76cm 9/10 years 31″ 79cm 11/12 years 32″ 81cm 11/12 years 33″ 84cm 11/12 years 34″ 86cm 13 years 35″ 89cm 13 years 36″ 91cm 13 years 38″ 96cm 14/16 years 40″ 102cm 42″ 107cm 44″ 112cm 46″ 117cm 48″ 122cm