Oscar De La Renta Wool blazer

Found this at an estate sale bought for my Dad for Father's day but it was too big. Not sure of the size, measurements below. The tag says Oscar De La Renta 5% cashmere/95%wool blend blazer. Made in South Africa. This lining needs mending but otherwise great condition. Measurements: 20 across x 31 long x 23 in sleeves from shoulder. No holes or tears except the lining is loose needs alterations.