I'm about 160lbs 5'10" I buy the medium tall since the sleeves are longer then the regular medium and the length is plenty to stay tucked into the pant even though it's rounded at the bottom so you don't have to tuck it in. In dim light the dark green looks like the charcoal grey. I wear the charcoal grey and light grey shirts with black pants and black boots, black belt. I wear the dark green with black pants brown belt and brown boots. I wear the dark blue with black pants black belt and black boots. I really like the two front pockets, the left side has the hole for a pen or screwdriver. These shirts look formal enough. I teach engineering courses at a highschool and have a shop. So, they're good for a classroom teaching environment and keeping safe around a drill press, grinder, miter saw, cnc mill, laser engraver...(I'm exagerating a bit) but the threads are so close together, metal shavings stay off the skin. I also use them after work when I'm on my tractor or garden but I use jeans then and the shirts are also formal enough to pick vegetables to sell at the farmers market.