If you’re going for a modern, stylish fit, go with your normal shirt size. If it’s a part of a layering system for warmth, maybe go a size up, but I’d recommend a proper puffy jacket or quilted flannel with a different cut if you’re going for pure function anyway. Trucker jackets are supposed to be slim, with cuffs at the wrist and a bottom that lands at the belt line. I’m a medium and the medium fits how I want. All that said, this is a cheap jacket. The first thing that struck me is that the tSee full review