Superlative form of classy: most classy.(adjective)
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Use "classiest" in a sentence
"Venerable British auction house Christie's is selling a case of what has been called the classiest wine in the world: Chateau Lafite 1982."
"Dumars (above, top, center) made his rep on one of the brashest teams ever to wear NBA uniforms, and he made it as a When Sport magazine named the NBA's "classiest" players, Dumars swept the voting."
"But while this is the "classiest" place in town, you have to remember ..."