I like TallSlim Tees [0] – pricey for what they are, quality-wise, but for me it's worth it to get a good fit for once. I have a similar build to GP (191cm, ~77kg) and wear a size medium in these. Very nice not needing to clad myself in a billowing sail just so my shirt can reach past my belt

[0] https://tallslimtees.com/