The A190 Ocelot Fleece is snug fitting, e.g when I take it off by pulling it up over my head (I wear it over a black merino wool T-shirt) if I don't have my T-shirt tucked into my trousers, the T-shirt will come off with it. I ordered a Medium based on my recently bought ARKTIS Contact Jacket in Medium, so the sizing is correct/true to size. It is snug around the neck and chest (for me at least, I have a 'largish' neck) but you can still move in it. The inside material is soft, not itchy. I'm clean shaven and when I go to work with the collar fully zipped up there's no itchiness or irritation. I wear it in an urban environment, just commuting to work, etc. If you were far more physically active and still wanted to have the collar zipped up all the way, no 'unzipping it down' I would consider the next size up. But I'd still recommend ordering a true size first as it may still be okay for your physique. The sleeves are the correct length (for my true size), ending at the wrist, but I can still stretch them down using the sleeve end thumb holes if I wanted too. Both the sleeve end cuffs and the waist bottom end edge has an elastic hem so the 'ends' stay snug and don't 'flop around'/aren't loose. I wear my watch (Casio Duro) over my left sleeve instead of under it as the sleeves are snug, an easy fix. My combination for winter (Sydney, Australia) is my black merino wool T-shirt, ARKTIS A190 Ocelot Fleece (relying on the high snug zip up collar for warmth and wind protection), black ARKTIS Contact Jacket (outer shell), and black ARKTIS C111 Cargo Trousers (with joggers). I've found the A190 Ocelot Fleece works well as a mid-layer garment in this configuration.