Save the Duck Ultralight packable women’s jacket

Ultralight and packable jacket by Save the Duck. Down alternative, barely weighs anything but keeps nice and warm. I received so many compliments on the color and jacket. Unfortunately it’s a bit too tight. This comes in size 3/L. I would say based on the fit this may be closer to a medium. I am a size 10 and it’s too tight. Pit to pit - 20”