Thanks for your replies!
I have Borrelli on my watchlist, but I think your example makes it clear that such a dramatic roll as in the initial pictures can only be realized with (hidden) buttons.
Proper Cloth is also on my radar, in fact I have a first shirt on order, just with a President cutaway collar. I have noticed the one with the hidden buttons, but that one looks kind of flat to me, not really curvy :)
Instead I am thinking of e.g. a (Soft) Roma Cutaway...