Crop cotton Chompas sweater

I can't say enough about how gorgeous this sweater is. Chompas is both the style, originating from Peru, as well as the maker (see photo of label). It is made in a beautifully soft cotton knit, with an impeccably worked patter in black, red, yellow, purple, green, and white. It is labeled size S but measures 36" across the waist (armpit to armit) so would probably fit a medium. It is a cropped cardigan cut with buttons covered in matching knit.