Ok after the jacket tips, it's good to know what to look for in pants too right?
This post focuses on what length to look for.
The ideal length looks like this, with one fold at the ankle:
This post discusses fit and recommends a straight or slightly tapered leg.
And this post says to watch out for bagginess in the crotch because it can make you look shorter.
Here is a good guide to dressing a man for his wedding, from top to toes.
The Black Tie Guide is another good resource.
You can get a suit custom-made for $450 at Indochino by selecting your styles and adding your measurements. Seems like a good deal but I wish they let you pick your suit fabric weight.
The real key to making any jacket or pants look good is the fit and the tailoring. You can always take something in that is a little too long or roomy, but letting something out is harder.