Vintage grandma Sigrid Olson size medium knitted gray and purple vest

Vintage Sigrid Olson v-neck cardigan sweater vest knitted in a cozy fair isle pattern, embellished and embroidered geometric design reminiscent of tic tac toe, possibly from 90s. Tag says size medium but please see measurements. Very good vintage condition, minus very faint brown stain near the bottom front, please see photo. Measurements: Length down from shoulder seam - 23 inches Bust- 19 inches across Bottom - 18 inches across Label: 55% ramie / 45% cotton Condition: Very good vintage condition, small faint brown stain on front (please see photo) Comes from a (small) dog friendly, non smoking home. Thank you :)