I believe that the denim shirt is the backbone of modern classic style. It's crazy versatile, it can play the role of a casual t-shirt but it also has the ability to step into the more conservative role of a white button down blouse. [caption id="attachment_10720" align="aligncenter" width="372"] Denim shirt, $30, hm.com/ca[/caption]   This sturdy cotton shirt was once reserved for workhands and tradespeople. Now, decades later it's become an essential in every man and woman's wardrobe. If you don't yet have one hanging in your closet this one from H&M would be the perfect addition — plus, it will only cost you $30. Here are some key features you should look out for while shopping for a new denim shirt.

• Skip the crazy washes and patchwork details. Pick a wash that looks a little bit lived in, but not overly faded.
• Look for snap buttons. Why? Just because they make getting dressed — and undressed — a lot more fun.
• Choose a style that's slightly oversized in length, this helps with layering.
• Styling tip: When wearing denim on denim never match the washes, you'll end up looking like a mechanic.