fauxshionista

1. One who poses to know all there is to know about fashion; 2. a self-proclaimed fashionista with no real sense of personal style; 3. A serial style copycat who wouldn't be able to get dressed without the latest issue of InStyle or Us Weekly.

Use faux for short.

The sales associate at Nordstrom was such a fauxshionista!

All the fauxs are anxiously waiting to mimmick Carrie's outfits from the Sex & the City movie.