These guys know what they are doing. All their shirts, tanks, sweaters are longer fit, and don’t cut off at your waist like most do. Pretty much every item I have purchased falls around the mid butt area, and I’m not ordering a size up on anything. For reference I am 6’, 220 lbs and approx 12% BF. I normally wear an XL in t-shirts, and that is what I purchased. It is a little longer, but not too tight up top. I’d recommend purchasing the size you normally do, and you’ll be good. If you like a shirt really tight, you could possibly order a size down, but I wouldn’t risk it.