Fashion or Style refers to the trend and customs prevalent at a given time at a given place. In its most common usage, "fashion" exemplifies the appearances of clothing, but the term encompasses more like the accessories etc. At a given time there may be many things together that can be in Fashion and popular amoungst the people. Important is the idea that the course of design and fashion will change more rapidly than the culture as a whole.
But one thing which always remain common to look good in the trendy clothes and that is the way one carries it and his or her self confidence in wearing it. So celebrate the style day or the fashion day by making your own style statment or complimenting someone on there sense of style and fashion.