Here's how to measure sweep:
1. Lay the jacket flat on a table or other even surface.
2. Use a measuring tape to measure the curved edge of the jacket, starting at one end and going all the way to the other end.
3. The measurement you obtain is the sweep of the jacket.
The sweep of a jacket can vary depending on the style and design. For example, some jackets may have a larger sweep, creating a more A-line or flared shape, while others may have a smaller sweep, resulting in a more fitted look.