opentip.com/size chart

XS

S

M

L

XL

Body Length

19

20

21

23

25

Body Length Tolerance

1/2

1/2

1/2

1/2

1/2

Chest Tolerance

1/2

1/2

1/2

1/2

1/2

Chest Width (Laid Flat)

11 1/2

12 1/2

13 1/2

15

16 1/2

Numerical Sizes

3/4

6/6X

7/8

10/12

14/16