From the french phrase "haute couture." Unfortunately the "haute" part means "high" and the "couture" part means having to do with fashion or sewing. Ignorant Americans mixed this up and now they use "couture" to refer to high end or luxury things. So next time you walk past a bakery offering "bagel couture" feel free to call them idiots, unless they actually sew their bagels.
The real meaning in French is not "fashion", as ignorant people would say, but rather means "sewing". The name is USED to describe fashion, but it is not its real meaning.
It is also a surname to many people of French descent. These people are extremely sexy and will give you an orgasm just by looking at them.