![](https://cdn.shopify.com/s/files/1/2574/2560/files/C1.png?v=1631550520)
Step 1: Button the jacket and lay it flat on a table face down with the collar up and arms positioned upward. Use your hands to gently extend and flatten out excess fabric.
![](https://cdn.shopify.com/s/files/1/2574/2560/files/C2.png?v=1631550559)
Step 2: Starting at the lowermost point of the left armhole, measure across to the same point on the right.