School Jumper & Sweatshirt Size Guide

School jumpers and sweatshirts are sized by chest — measure around the fullest chest.

Jumpers, sweatshirts and cardigans are sized by chest, like blazers — often labelled by age or chest in inches. Measure around the fullest chest; a little room lets it layer over a shirt.

Sized by chest

Room to layer over a shirt

School jumper chest sizes by age:

Age	Chest (in)	Chest (cm)	Height
3–4 years	21–22"	53–55 cm	98–104 cm
4–5 years	22"	55–57 cm	104–110 cm
5–6 years	22–23"	57–59 cm	110–116 cm
6–7 years	23–24"	59–61 cm	116–122 cm
7–8 years	24–25"	61–64 cm	122–128 cm
8–9 years	25–26"	64–67 cm	128–134 cm
9–10 years	26–28"	67–70 cm	134–140 cm
10–11 years	28–29"	70–73 cm	140–146 cm
11–12 years	29–30"	73–76 cm	146–152 cm
12–13 years	30–31"	76–80 cm	152–158 cm
13–14 years	31–33"	80–84 cm	158–164 cm
14–15 years	33–35"	84–88 cm	164–170 cm
15–16 years	35–36"	88–92 cm	170–176 cm