Measure around the fullest part of your chest and around your waist, then use the measurements below to select your size. Consider the layers you expect to wear underneath the jacket when choosing your size.
Chest
XXS (UK 6): 78–83cm / 31–32in
XS (UK 8): 83–88cm / 32–34in
Small (UK 10): 88–93cm / 34–36in
Medium (UK 12): 93–99cm / 36–39in
Large (UK 14): 99–106cm / 39–42in
XL (UK 16): 106–114cm / 42–45in
XXL (UK 18): 114–123cm / 45–48in
Waist
XXS (UK 6): 60–65cm / 24–26in
XS (UK 8): 65–70cm / 26–28in
Small (UK 10): 70–75cm / 28–30in
Medium (UK 12): 75–81cm / 30–32in
Large (UK 14): 81–88cm / 32–35in
XL (UK 16): 88–96cm / 35–38in
XXL (UK 18): 96–105cm / 38–41in