I found my dream tweed jacket (outerwear, not blazer): this Phillip Lim jacket from the Outnet. I ordered it in a small but it is definitely too big even though it's meant to be loose. Small is the smallest size the Outnet lists - I have no idea if it was ever made in an XS. My usual luck with finding things online has completely failed me (not on ebay for instance). Has anyone seen this jacket anywhere else? In an XS? You all are good at this type of thing.

(Or maybe I should get a second opinion on the fit? I'll try to add a photo later before I return it.)