I'm 6'9" / 206cm, and I've struggled my whole life to find clothing that fits, since I'm slim. If we're sharing links, the two I've been buying from lately are https://tallslimtees.com and https://www.2tall.com. The latter has a large selection of knitwear, which I've never found anywhere else, it's been a game changer. (Most tall sizes are both bigger and taller, so they don't fit correctly. These sites sell taller clothing that'sonly taller.)