I find it doesn't look right with a collared shirt underneath - it's designed so that there is no front or back so you can imagine that it tends to ride higher (and wider) than a typical one.
I'm using mine with button down shirts sometimes and it does ride higher but I think it works, unless I'm a walking fashion faux pas... I can see it potentially looking odd with unbuttoned shirt collars as you might get one side stuck underneath the sweater collar
Never heard of them before thanks. What’s wrong with the neck?