Adult Sterling Archer Costume

I ordered a medium and could pull the pants up to my chest (I understand they are trying to fit everyone into a set number of sizes but damn). The jacket is long too, little too big for what a medium should look like I think.I spent $6 for shipping on its way, now I'm paying $5 to ship it back...and I guess $6 more to ship a small to me :/I'm 5'8", weigh about 150 and am not particularly skinny or anything.Other than that, I think the costume itself is pretty nice looking.