Powder Blue Wool Jacket/Blazer

Very cool little jacket in the most perfect powder blue colour. It has a 1960’s vibe to it. Feels to be made of a soft wool and is quite warm. Has ornate gold buttons. I wonder if this was maybe part of a school uniform? It has that preppy formal feel. No size listed, I am typically size small and it fits a bit oversized on me. So I’d say it is suitable as a S-M fit.