fashion plate

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A person who consistently wears the latest fashions.
2. n. An illustration of current styles in dress.

Century Dictionary and Cyclopedia

1. n. An engraving exhibiting current fashions in dress.

Wiktionary

1. n. A picture, usually a full-page advertisement, showing the latest fashion in clothing.
2. n. idiomatic A person who dresses in especially stylish fashions.

GNU Webster's 1913

1. n. a pictorial design showing the prevailing style or a new style of dress.

WordNet 3.0

1. n. a man who is much concerned with his dress and appearance
2. n. a plate illustrating the latest fashion in dress