Vintage Drummond Mills Sportswear Pure Wool V-Neck Sweater Size: XS/S (Flawed)

Vintage Drummond Mills Sportswear V-Neck sweater. I don't know the year it was made but it's their older label (The "newer" labels from the 60s-70s were white with gold frame if I'm not mistaken). Small holes on the front (last 3 pictures), Color transfer on the pits. Stain on the back. Please compare measurements to ensure proper fit. No size tag so please compare measurements to ensure proper fit (my son wears a medium and this was too snug on him). My best guess as to the size would be an "XS" maybe even a "Small" 19.5" armpit to armpit. 17" across the shoulders. 17" across the hem. 22.5" shoulder to cuff. 23.5" collar to hem.