I found three of these from a business that closed down and still had some of their backstock from the 1940s-90s. So these are a few great examples from the 1950s. 1950s letterman sweater deadstock with tag!
*this one is for the size 42
Label: Exclusively for Father + Son Moose Jaw
Fabric: likely wool or wool blend
Measurements:
Pit to Pit: 20.5"+
Waist: 16" +
Length: 25.5"
Sleeve Length: 24.5" with unrolled cuffs
Shoulder to Shoulder: 18.5"
Condition:
they all have some uneven yellowing from storage - this one also has a few minor spots as shown - otherwise this one is in great shape - sold as found.