We adjusted sizing on the Small, Medium, and Large hoodies to bring them closer to what is more traditional. XL and above remain a tad longer. Everything was brought in from the width standpoint and since we added side ribbing on both sides it stretches so that it will fit a wider range of people.
At your size I would likely assume you were a medium or small if you want it quite fitted.
I hope that helps.
-Pete
PS I will be offline for the next few days but you can email infobox@jiberish.com and someone will be able to help if you or anyone else has specific questions. Cannot believe the response we have had to this pre-release since we went live. You guys are incredible. Thx.