1. Wear your pants at your natural waist. Too high and you look like Grampa, too low and you look like a high school kid. Your waistband should sit 2-3 inches below your belly button.
2. Pants should almost touch the ground without your shoes on. Jeans can be a little longer, since they shrink a bit when you wash them.
3. One pleat, maximum. If you’re a big guy, like I am, you learned somewhere along the line that pleats are slimming. They’re not. At best, they look like you’re a big guy trying to look slimmer; at worst, they actually make you look heavier because they pull out across you, broadening your appearance. In any case, the job of a pleat is to maintain that crease sown the front of your pants. For pants without that crease (and many with it), pleats are unnecessary; for pants that need the pleat, they only need one.
4. 1” to 1 1/2” cuffs. Or not. There’s nothing wrong with cuffs, there’s nothing wrong with no cuffs. They are understood, however, to be an older man’s style – not in a bad way, think sophisticated, experienced, distinguished, and conservative. For younger men, a cleaner line is generally preferred.
5. A useful piece of trivia for the American abroad: in British English, “pants” are underwear. So if, for instance, you are in London and get invited out and maybe your trousers are dirty from work, don’t say “I’d love to go out, I just need to go home and change my pants first.” And if someone should ask, “Why, are your pants dirty?”, don’t say, “Yeah, I always get my pants dirty at work.” You will be laughed at. Er, I assume.