Here is an excellent vintage buffalo plaid 100% wool hunting / woodsman jacket by 5 Brothers. This is 50s or 60s era, and is in exceptional condition. There is no tag size, but it measures between medium and large, see below for measurements.
Measurements:
Chest: 23 1/2 pit to pit
Length: 30 top of collar to bottom of jacket
Sleeves: 22 shoulder seam to end of cuff
*all measurements are taken with the garment lying flat