A man's belt is first placed through the loops on the left side of his pants. Therefore, before the belt is done up, the buckle is on the left and the open end is on the right. After the buckle is cinched, the unsecured flap is on the left side.
Fashion rules for belts depend on the occasion. For formal or business wear, a plain black or brown belt is acceptable. The color of the belt matches the shoes, and a silver buckle is considered more formal. A belt must be wide enough to fit comfortably through the loops. Casual wear allows more variability for material and color. Canvas, fabric, woven or leather belts are all appropriate. A color other than black or brown is allowed in order to bring out a color located elsewhere in the outfit.