Size Metric Extra Small Small Medium Large X-Large
Chest (cm) 76-81 86-91 97-102 107-112 117-122
Waist (cm)  71-76  76-81 81-84  84-86 91-97
Size Imperial Extra Small Small Medium Large X-Large
Chest (inches)  30-32  34-36  38-40  42-44 46-48
Waist (inches)  28-30  30-32  32-33 33-34 36-38

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Chest:

Measure under arms around the fullest part of the chest.
Be sure to keep tape level across back and comfortably loose.

Waist:

Measure around natural waist with a measuring tape.

This sizing chart is approximate.