Appears to be an acrylic/ cotton blend
Size tag on item: Medium
Measured lying flat:
* shoulder to shoulder: 18”
* armpit to armpit: 21”
* Length: 24” (measured from collar in the back, to bottom front hem)
* Sleeve: 18” (measured from armpit to end of sleeve)
This item is sold from an excellent, highly rated vintage seller in Quincy, IL.