The Freeman brand employs a couple different sizing schemes. Here are a few notes about them and a few tips for finding the best size for you.
Going back to our very first product - The Freeman Raincoat, we set out to build sizes that worked better than the lettered sizing one might often see. Less subjective, the numbered sizing was built around actual measurements and gave us better ability to tailor fits so that if someone was between sizes, it wouldn't mean having to settle for something that was way too big. Thus the 34-44 sizing scheme. If we had to distill it down into simple terms, we'd say:
34 = Extra Small
36 = Small
38 = Medium
40 = Medium / Large
42 = Large
44 = Extra Large

Scott is 5'10" and 155 lbs + wearing a size 36 Freeman Raincoat for a more fitted look.

Scott is 5'10" and 155 lbs + wearing a size Medium Puget Crew
As always, every item has a detailed measurement chart within the product page. A good practice is to compare the measurements of the item in question to the measurements of an item you currently own that fits well. Should you have more questions, please don't hesitate to reach out to info@freemanseattle