Great vintage Fox Knapp buffalo plaid shirt/jacket.  Mid-weight.  My best guess is that it is from the 1960's, but I can not guarantee that.

Acceptable condition. Overall, it looks really good with a few issues.  There is a stain/crusty area on the end one sleeve.  There is another small spot similar on the backside of the 4th button hole (not really an issue). Black material directly inside of cuff shows wear, fading, some tears, etc.(Again, not a big issue since you don't see it when worn).  Collar area has a bit more wear and some light fading.   Please review pictures closely as I tried by best to accurately represent the condition with the allotted pictures.  There may be some other small issue(s) not pictured or mentioned.  Sold "as is."

Men's medium

pit to pit: 23"

top of shoulder to bottom front: 25"

Please only purchase if you understand you are buying a used item with condition issues that are mentioned above.  This was used as it should have been, and there are issues with the condition.  It is likely over 50 years old.