While you might have been taught the four-in-hand knot the night before big-boy school for its time-saving simplicity, as you mature into worldly men, you ought to step up your tie-knot game. And it doesn’t get more big-boy than the Windsor knot. Learn how to tie it here 

"One of the big pocket square no-nos for me is when they directly match the tie, like they came together in a set,” says Dan Rookwood, US Editor at Mr Porter. “A pocket square should be used to add some interest in terms of colour and/or pattern.”

With this in mind, start by considering the rest of your outfit and then coordinate your accessories accordingly, without matching exactly. For example, a hint of burgundy in your pocket square’s print or pattern will team well with a burgundy tie.