Got my red sweater/blazer today and the arms are definitely tighter than most Zara blazers. Not terrible but really fitted. I got a size M.
I also got this blazer (red piped fantasy blazer) in the mail today... is it supposed to be 3/4 sleeved you think? lol on me the sleeves definitely come short. Shoulder/arm a little snug, but not horrible since material has a little give in it. is that how yours fit as welll