Using the images shown to you on the size guide page. Ensure your existing jacket is flat and measure from underarm pit to pit.
(Please provide measurements in CM).

Using the images shown to you on the size guide page. Measure across your jacket on the slimmest part. This is usually around the top button of a single breasted 2 button jacket.
(Please provide measurements in CM).

Using the images shown to you on the size guide page. Measure across the back shoulder from seam to seam.
(Please provide measurements in CM).

Using the images shown to you on the size guide page. Measure from the top shoulder seam down to the opening of the sleeve. Its important you guide the tape measure around the outside of the sleeve and do not pull it tight.
(Please provide measurements in CM).

Using the images shown to you on the size guide page. Measure from where the collar meets the shoulder seam down to the longest part of the jacket.
(Please provide measurements in CM).