Artlex.com is an excellent Dictionary of Art Terms

Artlex.com is a resource I have been using for several years.
I recommend that you give this resource a try by clicking here.
Most definitions are followed by illustrated examples of the term as well as external links to additional resources.
I highly recommend this online Art Dictionary for educating oneself further about any topic that is included in the arts.
Here is a definition for FASHION from artlex.com:

The prevailing style or custom. Most often refers to clothing (costume), but may refer to any cultural trend. Manner or mode. Also, to give shape or form to; to make. Fashion design refers specifically to designing clothing, and its associated accessories.

*And, of course, the above is only the introduction to information about fashion.
*Also, in the definition for FASHION each of the words that are in bold print are linked to their individual definitions!