When you have an apple shaped body you want to put the focus on your legs, your bust, and sometimes your waist. This is mostly to create a more hourglass looking figure and ensure that you look more balanced. For the reason stiffer fabrics, chunky belts, and simple designs are a great idea. You should generally avoid clingy clothing, and instead opt for clothes that help shape you into your desired shape.
The first and most important part of any outfit is going to be a bra with good support. This will make your stomach look smaller, bring your top more in line with your hips, and serve to highlight your neck and chest as well.
Common garments are sun dresses, plunging tops, long tops, and wrap dresses. For pants, flared or boot cut jeans can really bring out your figure and help emphasize your curves. Overall, you should avoid overly distracting patterns, gathered fabrics, and chunky accessories on the middle of your body.
Reference 1: http://www.thechicfashionista.com/apple-body-shape.html
Reference 2: http://www.joyofclothes.com/style-advice/shape-guides/the-apple.php