Not quite as shallow as a fashionista, but someone who deeply enjoys fashion and looking good. A fashionistette can be intelligent, worldly, and cosmopolitan, knowledgable about the world and considerate of people around her. Compare to metrosexual (and note that, in women, no one suspects looking well-groomed and fashionable has anything to do with their sexual choices). Fashionistettes and metrosexuals have the flavor of retro and classic Vegas -- they are "just swell."
Everyone loves having Betsy at parties. She's a fashionistette, she can talk about anything, she brings bubbly and she shows up with these incredible examples of metrosexual hunkiness. Having Kat over isn't as fun; she's a fashionista, a bitch, and nothing else.