having elegance or taste or refinement in manners or dress. Opposite of styleless.

exhibiting refinement and high character. Opposite of low-class

elegant and fashionable; "classy clothes"; "a classy dame"; "a posh restaurant"; "a swish pastry shop on the Rue du Bac"- Julia Child

Classy , abbreviation of Monthly Classy Magazine, is a Japanese women's magazine published by Kobunsha. Its title Classy is derived from an English adjective http://en.wiktionary.org/wiki/classy classy.