When it comes to the clothes you wear, you've got your basic essentials—a great pair of jeans, a dark suit that works for both business and pleasure, along with some T-shirts and a few tailored button-downs. And you probably have a few more trendy, of-the-moment pieces that you likely won't be wearing a year from now. But you should also consider building out your permanent collection with some smart and durable pieces. The kind that will always be in style and look good on guys at any age. Consider this a checklist—you don't need to buy these exact items, but you should look for the best quality you can afford. After all, these are the pieces that you'll be wearing for years to come.