It's explicitly described as a "Long-sleeve super 160's wool two-button single-breasted mini check suit." Which gives rise to the question, "Are there so many _short_ sleeve suits out there that it's truly necessary to point out this suit's long-sleeve nature?"
Welp, it happened. I saw a short sleeved suit jacket at a designer consignment shop today. I bought a nice PWVC grey cardigan, but I'm certain someone will want me to proxy this.