Kimono doesn't have much of a definition beyond
item of clothing. However, these days it usually refers to the
furisode worn by
young unmarried women. The current fashion (
Meiji period on) makes the woman's body into a sort of flattened tube. Quite restrictive. Thus the "fetching" little walk. Try binding your legs together at the thighs, knees and calves, and see how you like it. :p Kimono have gone through many, many incarnations, ranging from dozens of layers to just a couple, from loosely tied to the current
burrito-effect.
There are a lot of rules about wearing kimono, from the colors that go together to getting one with the appropriate seasonal indicators.