One who studies the fashions; a fop; a dandy.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "fashion-monger" in a sentence
"Desnoyers had to interest himself in her apparel with the same devotion, mixing his appreciation of the latest freak of the fashion-monger with his eulogies of Marguerite's beauty."
"But she was much more than a mere fashion-monger: and what has lasted best in her was not mere fashion."