The internet still hasn't quite managed to figure out this clothing thing, in part due to size and style variations. Cladwell doesn't solve the problem either, but it does have a pretty unique way of analysing your current wardrobe and finding what else you need.
The service begins with a series of vague questions about the kinds of clothes you want to buy (do you want to stand out or fit in?) and body size/type, hair colour, eye colour and so on. The results then feed you a basic wardrobe. As one might expect with a service like this, the specific examples aren't necessarily dead-on. For example, anyone who knows me would not expect me to wear a pink tee.
However, as a source of inspiration and general idea-generating, Cladwell is useful. It can show you things you might not have thought you needed, as well as provide some examples of how different looks might fit together. Someone already well-versed in fashion will probably find it rudimentary, but if you're just starting out or trying to clean up your closet, it's a decent first step.