In one sentence, describe what the following article is about:

A classic blazer can easily dress up a simple shirt and jeans, transforming it from everyday casual to business-casual. Look for a fitted blazer in a traditional color, like black, navy, or deep gray.  Alternatively, look for a blazer in a bright color to add a little spice and personality to your look. Any pair of jeans looks great with a crisp white tee, a blazer, and a sharp pair of shoes. To make the look more feminine, add on a statement necklace or a stack of eye-catching bracelets. Structured shoulders make a fashion statement, so look for a jacket with interesting shoulder details. A look this strong benefits from being dressed down with a pair of jeans. A leather jacket with strong shoulders looks great worn with slim-fitting jeans, ankle boots, and a simple tee or tank. A belted jacket adds structure to your outfit, easily dressing up even the simplest of shirt/jean combinations. Wear a pair of straight-leg jeans in a dark color with a belted trench coat and a pair of practical shoes for a no-nonsense look you can wear almost anywhere. When you want to play up your femininity, a fitted cardigan in cream or white is just the thing. Look for a cardigan with feminine details, like faux pearl buttons, in order to make your jeans look even dressier. Wear your fitted cardigan over a pretty top, like a lacy camisole. Complete the look with a pair of boot-cut jeans, a strand of pearls, and Mary Janes.
Add a blazer over your top to create a more professional look. Wear a jacket with a strong shoulder for a high-fashion look. Try a belted jacket to emphasize your waist. Slip on a fitted cardigan sweater for a feminine look.