If you want to make a killing, it helps if you dress the part. With Wall Street on the rise again and the national nightmare of casual Fridays far behind us, men are ditching their workweek khakis and sneakers for that alpha-male wardrobe staple: the power suit. But whereas nineties deal makers – think Leonardo DiCaprio in Scorsese's upcoming 'The Wolf of Wall Street' – favored linebacker-size shoulder pads and oversize cuts, the modern business suit is more minimal. "A suit's shoulder gives away its decade," says Nick Wooster, former Neiman Marcus fashion director. "Today's power suit is narrow and more tailored – a man doesn't want to wear a costume." Or a clownish color: Go with gray and no matter what, you'll look like a boss.