Vintage Leslie Fay Blazer/ jacket. S/M

This true vintage Blazer/jacket is in pretty good vintage condition. Bottom button has been repaired. Original size tag is missing but I would estimate it to be a small to medium current sizing. 3/4 length sleeves. length of jacket from shoulder to bottom hem is 21 in. laying flat, armpit to armpit is about 18 and 1/2 in. Would fit a medium fine as long as you don't want to button it. Buttoned, it would fit a small. Material feels silky or satiny but not sure what it is.