Wool blend Roots button up cardigan purple mix size medium (fits small)

In great pre-loved condition classic Roots cardigan. Main body is purple mixed with white and grey. Grey and cream ribbed cuffs and hem. No rips, holes or stains. Minimal pilling consistent with material. Material content: 40% Wool 20% Nylon 20% Viscose 15% Cotton 5% Acrylic Size tag says medium; however, this appear to fit on the small size. Please review measurements below to ensure a proper fit. If you require additional measurements shoot me a message. Approximate laid flat measurements: Pit to pit: 16.5" Outer sleeve length from shoulder seam to cuff: 24" Inner sleeve length from pit to cuff: 18.5" Center back length from base of collar to bottom hem: 22.25"