The fashion in London is more classic and unique while the fashion in the US follows many celebrities and stars who get their style from the catwalk.
Also London fashion leans more to the Paris...
Chicago fashion is primarily the same as New York's fashion, though it depends on what kind of scale you're talking about. There's the preppy New York fashion, the high end fashion, the couture...
summer warm or cold spring and Autumn those are different degrees in the hemisphere on what it all means if it says that obviously a type for the weather i understand your looking for the right...