This merino wool shacket (shirt + jacket) is a really nice layer for those days when you need more than a sweater but not quite a coat! I sized up for more room for layering, I'm in the large. You do not have to size up! It runs generously. I'm in the 30 of the jeans and large of the sweater. The sweater runs snug, size up for wiggle room. @onequince quincepartner quince LTKOver40 LTKFindsUnder100