Gunne Sax by Jessica McClintock vintage blouse

Vintage Gunne Sax by Jessica McClintock white blouse with pearl button and lace details. I love this but it’s too big on me and I’m selling rather than alter to take in since it can be hard to find vintage Gunne Sax in bigger sizes. See pictures for measurements. There’s no size tag, but I’d estimate a modern medium? I’m usually extra small or small in modern fit garments and sometimes need a medium to fit my chest, but this gave me plenty of room to move and is designed to be more fitted. Some fading evident on label. No fabric care tag but it feels like a poly/cotton blend and that is common for this vintage era of late 70s or early 80s Jessica McClintock. #prairie cottagecore Victorian Edwardian festival boho bohemian 70s vintage Yellowstone western country button lace heart eyelet mutton sleeve fitted