Vintage plaid autumnal jacket - very cute very profesh

Such a perfect autumn/winter fit Blazer is in good condition, I recently dry cleaned it, but again haven’t reached for it in a while and wanting to rotate the jackets. There is some dull brown discolouration on the right shoulder, it was like this when I purchased and hasn’t come out with dry cleaning. It’s faint, but still present. No sizing labels on it, but I would say it’s a small