size guide:

small - chest (inches) 35-37. body length (cm) 69.5

medium - chest (inches) 38-40. body length (cm) 72

large - chest (inches) 41-43. body length (cm) 74.5

x-large - chest (inches) 44-46. body length (cm) 77

xx-large - chest (inches) 47-49. body length (cm) 78.5