What you need to know about men’s fashion

1. Honor thy tailor. According to GQ, even the best suits need altering. In men's fashion this is probably the most important detail that is not always adhered to. Pants need to be shortened, jackets need to be brought in, sleeves need to be narrowed (yes, you can ask your tailor to slim down your sleeves), and buttons need to be realigned with buttonholes (most guys' shoulders aren't entirely even, meaning your jacket often sits a bit askew).

If you're going to buy off the rack, you should always buy your correct size, then have a tailor customize it to your body. GQ says that the chances are you're wearing your suit a size too large. Its shoulders should hug your shoulders (not jut out past them). Also, have your tailor size the sleeves so they stop at the hinge of your wrist (not halfway down your thumb) and to size the pants so they break once (not gather in a baggy mess at your heels). Having your tailor properly fit your suit is the difference between being appropriately dressed and being stylishly dressed.

Custom tailored suits and even dress shirts are another option. Custom tailoring means that everything will fit right - and if you need to have a lot of alterations done on ready-made clothes, it may be an economical alternative.

2. Thou shalt learn when to cuff 'em. If you're wearing a trim, modern suit with flat-front pants—the kind often shown in men's fashion magazines—you should not cuff your pants. However, if you're a guy who likes a classic suit with a sin