MEN: To Look Taller and Thinner

• Wear clothes that fit well (too tight or too loose clothes add pounds).  
• Wear solid colors, preferably in the same color range, from head to toe.  
• Avoid stiff fabrics and nubby textures.  
• Wear darker tones in smooth fabrics with flat finishes.  
• Limit stripes to very fine, subdued, and close-together versions.  
• Wear two-button jackets with natural shoulders.  
• Wear trousers with vertical pockets, which are more slenderizing than slanted pockets.
• Wear trousers at the natural waist (never below)  
• Wear hemmed, not cuffed, trousers.  
• Wear classic-length jackets, preferably without vests.  
• Avoid too many accessories.  
• Be sure your tie touches the waistband and that it is medium in width.  
• Avoid busy patterns.

source : http://coffeewithpensy.blogspot.com/2011/12/mens-fashion.html