Vintage 70s BIGMAC Big Mac JCPenney Flannel Shirt L Size

Vintage 70s BIGMAC Big Mac JCPenney L Size
Flannel Shirt Cotton Heavy Flannel Shirt
1970s Single-color tag
65% Cotton 35% Polyester

US-L Size
Actual Size (flat measurement), please allow for some error.
Shoulder width approx. 48cm
Body width approx. 61cm
Length approx. 73cm
Sleeve length approx. 62cm
It would fit like a Japanese XL size when worn over a T-shirt or long-sleeved T-shirt.

Condition
I bought it at a flea market on the West Coast of the US about 30 years ago.
I wore it a few times back then, but I haven't used it since and have kept it in storage.
There is some pilling overall, but there are no tears or fraying, and I think the condition is relatively good for something 40-50 years old.

Please understand that this is vintage clothing and purchase accordingly.