Kenneth Cole suits are an American brand with a good amount of swagger to it.
This brand was known for its shoe line for many years since it was started in the early 1980s. It's been geared toward younger urban professional males. Compared to, say, Brooks Brothers, this line has a hipper image for the most part. You will fit that many of their suits are a slimmer, more fitted feel. KC suits are fine for a night on the town or for a more formal occassion. If you're looking for a conservative cut, you may want to look elsewhere.
I would consider this a notch down from Brooks Brothers as far as overall quality. As with most American fashion houses, they have several labels.
New York- This is the top of the line label. You'll find these at the actual KC retail stores.
Unlisted - Most people call this a little more trendy than the New York line. Quality is not quite as good.
Reaction - The lower end of the KC line. You'll find a lot of accessories and items at the factory outlets labeled accordingly.