1980s-90s Abstract Floral Print Blouse with Vest Styling and Buckle in Back

100% viscose fabric with a broken-in woven texture that I had guessed was a soft wool blend. Detailing is reminiscent of a menswear vest - single chest pocket, points at the front hem, adjustable buckle in back. Pulls in slightly at the waist, and has buttons at the cuffs. When it's lying flat it measures 22" pit to pit; 18" across the bottom opening with the buckle adjusted as shown; 19" long in back; 23" long at the points in front. It should have a little volume to its fit, so I'm calling it a medium - large. Condition is good. Has a broken-in feeling, and a little hole on the left sleeve has been patched (see last photo).