Burberry Prorsum Collection Blazer

It’s true cat walk collection, I got it as a gift good few year ago. Perfect condition, wore it on just a few occasions and now it feels too tight. Size is not specified but I believe it will be 4/6 UK size, arms are very narrow. I am size 8/10 UK and as you can see on the pictures it technically looks like it fits however it feels tight. It’s beautiful fit, very flattering. It’s Lana wool and velvet.