Vintage Donagain Floral Sweater Scalloped Collar‎

Vintage Donagain Woman's Sz S Bright Floral Sweater Scalloped Collar There is a button on the back of the piece but there isn't a hole for it to go into so I'm not sure what it's for. In excellent condition with no stains or holes. There is a bit of wash wear because of the age of the piece. Measurements laying flat- Pit to pit- 17 in Length- 26 in