White Tee shirt

[artsperson]

My partner, 5 foot 9, 67 kilos, complains he can't buy a decent white tee shirt that fits him, keeps it shape and has the right cut! Can anyone help him?

You might find this helpful:
https://www.gq.com/story/the-best-white-t-shirts

That's American, try this:
https://www.gq-magazine.co.uk/gallery/white-t-shirt-every-man-needs-one