It's rather thin jersey, and I would show you a close-up of the purple rings if my stitches weren't so wonky. Always a pain, stitching neat lines on jersey. But I was glad to finally find a use for the rings, I got these from my grandmother at least 12 years ago. Despite the wonky seams, this was a fairly easy top to sew - another afternoon project. I used parts of the pattern from the basic floral top. To add rings, just shorten the front part at the top and lengthen the back shoulder parts. Sometimes, it can be that easy!
P.S. I look super skinny in these pics, but I assure you it's just the light!