When the warmer weather starts to creep in, floral dresses become ... A head-to-toe denim look feels business casual, especially in a dark wash and when paired with pointy black slides.

The cardigan made the whole look feel casual for the red carpet, though, and she may have looked more red-carpet-ready if she paired the skirt with a formal top. Cox's black dress looked more like ...

Jeans can be business casual if they are a dark wash such as dark blue or black. Also, stick to a classic trouser or straight-leg cut. A dress shirt or a blazer can elevate the overall look when ...