Having style, to me, is someone who can use colour, shape and pattern to create an interesting visual effect.
Regarding clothes, the style has to achieve an over all purpose, to be striking, to be functional and to be flattering. Flattering styles obviously vary depending on cultural social norms. Generally in western culture it is deemed attractive if a female is slim and tall, or even slim and curvaceous. Manly because these are charateristics common within fit and healthy individuals, and ultimately females who are going to be better well equipt to carry children, and give birth (Sorry to get all phsyio/anthropological on you!).