Women’s very vintage equestrian themed stretch shirt/ blouse by Wayne Rogers

This is a fabulous vintage multi colored treasure that has a lot of stretch to it horizontally . It measures 19 inches pit to pit. Sleeves are 22 inches long and center back to hem =25 inches. It originally had a tag that said size11/12. I would say it a small to medium. But a small medium. In excellent possibly never worn condition. A good example of fabric art telling a great story.