Grana silk shawl collar blazer size S

I purchased this blazer directly from Grana in early 2017. I absolutely loved it and wore it a ton but it is still in excellent condition. I couldn’t find any signs of wear. In my opinion, the blazer runs small in the shoulders so I would compare the measurements below to something you own. The fabric is 100% silk and does not have stretch. At the time of purchase, I was consistently an XS and I had to size up. Now I’m consistently a S and I can wear it, but it’s just too tight on the back shoulder/armpit area when I move my arms. The measurements are approximately 15” W across the top shoulder 21” W at bust 26” L in front and 30” L in back The model photos are borrowed from Elaine at Fairly Curated blog. Grana is similar to Everlane, Quince etc.