“We see guys wearing their tie bar too high or too low all the time.
The rule is simple: It goes between the third and fourth buttons of
your dress shirt."
"It may sound obvious, but a tie bar doesn't just clip the front end
of your tie to the back end. It fastens both ends to the placket of
your shirt."
"Finally, never wear a tie bar that's wider than your tie. That's the worst! Keep things narrow."