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Color: The main four colours for suits worn in business are black, light grey, dark grey, and navy, either with or without patterns. In particular, grey flannel suiting has been worn very widely since the 1930s. In non-business settings or less-formal business contexts, brown is another important colour; olive also occurs. In summer, lighter shades, such as tan or cream, are popular.
Funny how the navy pinstripe and grey chalkstripe, once the staple of the gentleman's wardrobe, have now be absorbed by the business world to the extent that wearing either for leisure is considered inappropriate by many.
Pleated front or flat-front: Pleats work well if you have larger thighs or if you carry extra weight low on your torso. One or two pleats can give a classic look to dress pants, but they can be too much on a slim man.
Slim-fit or wide-leg: It's not just a matter of fashion; different styles work better on different body types. Slender men will want to choose slim-fitting slacks, so they won't look like they're borrowing clothes from Dad. Men who are larger on top -- either with a belly or a muscular chest -- will want to choose wide-leg pants to balance their upper and lower halves.
Cuffs or no:
Cuffed pants are definitely considered the dressier option when wearing a standard suit or the odd trouser, but black-tie tuxedo pants should always be without cuffs.
One rule for pant cuffs says that flat-front pants should not have cuffs. Although this is not always true, the rule should be considered with caution. Flat front pants and cuffs clash because they are derived from different cultures. Flat front pants are considered to be a continental European tradition; Pleated fronts and cuffs are of Anglo-American origin. Although these may sound like obscure details, mixing these two styles is fairly obvious to well-dressed gentlemen and should be avoided.
Cuffs on narrow pants will create either unsightly break(s) or a highwater effect.
From Andy Gilchrist's Encyclopedia of Men's Clothes, Trouser Chapter:
Slim cut, narrow pants, will have more break because they hit the shoe higher up.
Cuffs are hemmed straight across, with the back around the top of the shoe heel so you get a full break.
The narrower the trouser, the more front rumple.
People with extra curvature of the back or big butts will also affect how the pant bottom sits without alteration of the rear.
When fastening a three-button suit, the middle button is fastened, and the top one sometimes, but the bottom is traditionally not designed to be (although in the past some jackets were cut so that it could be fastened without distorting the drape, this is not the case with current clothing)