"That's very '70s dad looking," said a friend at the sight of my polo last summer. He was right, but that doesn't make it a bad thing. The shirt in question was a knit polo, sometimes referred to as a "sweater polo." They're a nice alternative to the traditional cotton pique ones you see at almost every retailer and are a little more dressed up than your average version. So go ahead, embrace your inner '70s dad with any of these options. They're really more Mad Men on holiday than anything, though.