Incredible Vintage 1976 Cotton Duck Canvas Khaki Vest Equestrian Back Decal sz S

An awesome standout piece Made in 1976 Cotton Duck Canvas front Equestrian decal inside and along the back I'm not sure how to read the size, so marking it as a Small based on measurements. Please refer to the below. Approximate Measurements Taken Laying Flat Pit to Pit - 18 Length of Back not including Collar - 22.5