A henley is a great play for when you’re unsure about the weather. It’s a little sturdier than a standard shirt, but won’t leave you sweating when it starts to heat up. You can throw it on over a button-down if you wish or wear it under a jacket. It also will come in handy if you run into one of those below-freezing days because you’ll be able to put it on under your shirt for an extra layer of warmth. The secret to a henley is to get a thermal piece that is slim-fitting and simple. Too often designers mess up their henleys by trying to get too tricky, but luckily the reliable Ralph Lauren has perfected it. It’s super soft and the perfect earthy oatmeal color. You can get yours for $98 at Ralph Lauren.