Vintage Army Jacket/Vest with RARE Frog embroidery

RARE vintage army jacket with unique embroidery of a frog (and word “ribit”) on the back. Estimated 1960’s or 70’s (potentially older). Sleeves have been cut off at some point in its history to create a vest. Some minor stains and markings, and one small hole (see photos) but condition is consistent with something of this age. Overall, a really cool and unique piece. Looks great worn open over a t-shirt. Estimating size medium. 20” across chest pit to pit. 26” long from shoulder.