Mint green satin with small pink floral pattern
It would be better if you could post a picture of it
The original fabric may have faded with time. If you can get a swatch from inside the chair that shows the original color, you can call around to retail stores to see who carries satin, or check with wholesalers if you have a vendors license.
You can also check the internet. Many fabric places on the net will send you a swatch - some for a small fee.
We always like pics.
Gene