vintage boxy plaid knit sweater with exaggerated sleeves

vintage 1970s knit sweater in a cool tone purple red and blue knit. no materials tag but feels like a medium to heavy weight wool or wool/acrylic blend. tagged size 11, best suited to a medium with a boxy fit. the collar is a little taller than a crewneck. fits slightly cropped. preloved and hand-washed with no holes/stains/odour. pit to pit is 19", waistband 12" to 19", length is 21"