Fashion as an Art? or Usability?

I view fashion as an art as well as usability. Fashion is more of an art to me when I am designing because I like to bring my thoughts to life. My inspirations can sometimes come from something abstract and artistic. I also try and think about how wearable a garment is. Ultimately, someone should be able to wear your clothing. Should you be able to wear all of the clothing, or is fashion for the viewers entertainment? Many different designers have different purposes when creating clothing. Some garments come across a little costume like, while others make me go "I would wear that".
I find it interesting when designers create garments that aren't necessarily wearable but they look amazing. When I view clothing like this, I think art. When I look at someone such as Donna Karan, i think she is creating clothing for everyday wear. I design with the combination of both.
Fashion as a whole is a number of things. Whether designers use more of their artistic side of if they are trying to appeal to the everyday person, it still is fashion.