Black Is Slimming
Just because black is the most slimming color doesn’t mean you should fill your closet with it. Chocolate brown and navy have a similar effect and they can help you create much more varied look. If you do stick to a black bottom or top, add some color in your look and finish it with accessories and makeup that show your flair with color. Don’t go for too many bright shades, but stop fearing color.
Loose Fitting Clothing Is Always Best
While a very right fit is rarely flattering, keeping it loose is one of plus size fashion rules to break. Since loose clothing sits at the widest part of your body, they actually add even more volume to your look. Go for a good fit with a pencil skirt, a tunic (with a belt!) or even with a bodycon dress and show off your style and abandon the loose clothing myth.
While horizontal stripes can make you look shorter and wider, that doesn’t mean they will every time. Thinner stripes are better, while wider ones create big blocks of color which are really unflattering. Try a combination of darker shades when you wear horizontal stripes or start slowly by wearing either a striped top or a bottom, paired with a solid color.
Source from: http://www.becomegorgeous.com/fashion-style/style_tips/plus-size-fashion-rules-to-break-A12751