Vintage Anne Klein blouse size small

My moms vintage blouse top from the 80’s, with little shoulder pads, this beautiful super soft flowy blouse buttons up like a turtle neck with 3 silk-like buttons on the back of the neck. It feels soft like silk but is polyester. It’s Anne Klein vintage size 6 but I am typically a size small and it fits well. Armpit to armpit 21” Neck to bottom is 23”