As the old saying goes, the devil's in the details. And, after you've figured out the basics of your outfit (which, ahem, you've obviously done by now) it's time to start paying attention to those details. The watch is a nice place to start, the socks are good too. But the ultimate sign of a man who pays attention is a nicely contrasting pocket square. And with this Topman version selling at a grand total of £6, we'd say it's the fiscally responsible thing to do. (£6, Topman)