fashion plate

noun2

1. •
   A picture, usually a full-page advertisement, showing the latest fashion in clothing.

   • By turning the skirt and adding a ruffle of rhyme you would hardly recognize it as vers de societe with neatly shod feet and a fashion-plate illustration. — 1917
2. •
   A person who dresses in especially stylish fashions.

   • I'm no fashion plate, and don't dress to impress.