THE BUTTONS: Mother-of-pearl buttons are harder than the more ubiquitous plastic. Insist on them — they last.
THE GAUNTLET BUTTON: A button halfway up the forearm that makes it easier to roll the cuff. It should otherwise remain buttoned.
COLLAR STAYS: A dress shirt isn’t dressy without them. They should be removable, but they’re essentially forgiving the collar some body.
THE GUSSET: A triangular piece of cloth where front and back tails meet on each side. It reinforces the side seams.
Courtesy of Esquire.com