Vintage Lee Long-Sleeve Western Shirt Pearl Snap Blue Plaid Men's

Shirt shows some normal wear but in overall good condition. No rips or holes that I noticed. This is a thin materialled shirt (supposed to be that way). Comes from a non-smoking home. I don't see a size tag anywhere. Here are the measurements:

Armpit to armpit: 23 inches
Sleeve length: 23.5 inches
Total length (top of collar to bottom of shirt): 34 inches

Possibly a men's size medium to large?