The real rule is that if the side seams have a “slit” at the bottom, so that the last two or three inches of the tail hem don’t meet , then the shirt is meant to be worn untucked. (There’s a technical name for this in sewing, but I’m ignorant of all that crap… but the spousal unit is an expert.)
I’ve even found “tuck-in” shirts in my inventory on which the wife had ripped the seam and resewed in order to make then “no-tuck” shirts, 'cause she thinks the untucked look is rico suave.
So am I a conformist if I don’t tuck & if I buy clothes that are ostensibly too large because binding clothes drive me (even more?) insane?
The only good suit I’ve ever owned was fitted by a tailor who actually listened. He put me into a jacket that was a size or two too large, and then brought it in so that the arm holes wouldn’t drive me nuts.
I still must agree with Horace, however, that “neckcloths…connote effimanacy and poor health.” At the very least, if one insists on insisting on neckties, one could at least know a Nicky from a Pratt, and a Grantchester from a Balthus, no?