Do Wear ...
... clothes without much contrast. A monochrome outfit presents an unbroken line from top to bottom, which makes you look slender.
... shirts with stand-up collars, rather than the typical knit polo collar, which lies flat. A stronger collar offsets a full face.
... shirts with vertical lines.
... cardigans. They can be buttoned or zipped to draw eyes from your waist.
... flat-front pants (which are slimming) or pleated (which can offset love handles). Try both to see what looks best.
Don't Wear ...
... form-fitting clothes.
... clothes that emphasize top and bottom, such as a white shirt and dark pants.
... bright colors. Medium to dark are most slimming.
... your trousers below the waistline, with your paunch hanging over.
... cuffed trousers. The aim is to elongate.
... horizontal-patterned shirts. Patterns generally are dangerous unless they are small and subdued.
... chunky or "loud" belts. They cut your silhouette in half and emphasize your waistline.