I had a double tin coat for many years which allegedly was a "Long", but it in fact was 3-4" shorter in the body that my wool Filson Coat. I inquired "why" to Filson, they said "Send it back ,and we'll have a look" (Remember this coat was at least a dozen years old) They looked at my coat, said "Wow, that's old, must have shrunk up over time" and sent me a new coat. Hooray for Filson, I didn't ask for a coat, just wanted to understand why they sized different coats differently.

Point of the story is that, if the cotton coats are subject to shrinkage, be careful about washing it