J.Jill nordic fair isle cute and comfortable size M

This sweater is really cute on! J Jill Nordic fair isle sweater. Vintage inspired colors, so comfortable for fall winter. Size medium petite bust measures 20 1/2 inches across length to the front 22 inches long to the back 24 inches long I am not sure why they call this petite it does not seem petite to me more like a bit of an oversized medium