Bill Blass - "Style is primarily a matter of instinct."

I think each designer has their own genuine fashion philosophy. Staying true to it is maybe one of the reasons for the great success some designers have had.
So here's some designer quotes:

Vivienne Westwood :
-"Fashion is very important. It is life enhancing and, like everything that gives pleasure, it is worth doing well."

Giorgio Armani:
-"The difference between style and fashion is quality."

Gianni Versace:
-"In the past, people were born royal. Nowadays royalty comes from what you do."

Halston:
-"You are only as good as the people you dress."

Manolo Blahnik:
-"You put high heels on and you change."

Isaac Mizrahi:
-"Sometimes I'm really dressed up, and it really turns me on."

Karl Lagerfeld:
-"I wanted to become a cartoon artist, a portrait artist, and an illustrator. This was my first idea."


sources:
www.brainyquote.com
http://thinkexist.com