swank

(noun) elegance by virtue of being fashionable. Synonyms: chic, chicness, chichi, modishness, smartness, stylishness, last word.

(verb) display proudly; act ostentatiously or pretentiously. Synonyms: flaunt, flash, show off, ostentate. Examples: "He showed off his new sports car."

(adj) imposingly fashionable and elegant. Synonyms: swanky. Examples: "A swank apartment."