Vintage New Mexico Shirt

Here is a great vintage shirt. Not sure what to call it. It feels like a T shirt, but has the edging at the cuffs and bottom seam. It feels like a poly/cotton blend. The tag is toast, so I can't really read it. As for the shirt, it's a great purpley gray color with red and brown stripes across the front, under "New Mexico" graphic in white. Looks like it says copyright 1984, but again, that's hard to make out. This one is so super soft and comfy, and it's in amazing condition with tons of life left. Here are the measurements taken laying flat (please refer to the last pic to see how I measure shirts)

Chest (armpit to armpit) 19"

Shoulder to end of sleeve (including cuff) 11"

Length 27"