Banana, or straight (rectangular) shaped women's waist measurement is less than 9 inches smaller than thier hip or bust measurement.
I personally fall under this category because my waist is about two- three inches too big other wise I would fall under hourglass. I will give you a few tips on how to dress your shape to make it appear more curvy and flattering.
1. Wear Horizontal Stripes
wearing horizontal stripes on your bottom half is a really good idea.
Why? Because most women who fall under the banana shape have little to know hips and the stripes going across the bit of hips you do have will make them seem wider giving the illusion that you are curvier than you really are.