Here's a tip for the ladies: a nice fitted blazer can class up a casual outfit as well as emphasis the smallest part of your waist.
This is on my mind because I just bought one for my speaking engagements I have coming up. In trying on a few I came across things to look for and things to avoid.
Avoid Boxy shapes. It's tempting to try and hide, but if it looks like a box on the hanger, it will look like a box on you.
Look for darting and tailoring panels along the front and back. They look like little curves and emphasize your curves.
Avoid overly tight bodices. If your girls look like they are going to bust out of the top, you either need a different cut or a larger size and have the waistline tailored in.
Look for a flattering neckline for your shape. Try on a few styles and see how they fit you. Make sure the button lines up correctly without pulling or puckering.
Watch the ties. A well placed one can make your waist look tiny, a bulky one only adds unnecessary girth to you. When in doubt, TRY IT ON!!