Vintage Mexican rug vest.
It's sewn down the sides with arm holes.
Open in the front with no buttons.
There are a few loose fibers - see photos.
MEASUREMENTS:
armpit to armpit - 21 inches
shoulder to shoulder - 21 inches
length - 29 3/4 inches
arm holes - 11 1/2 inches, from top to bottom
collar - 1 7/8 inches wide