* Formal: "The hotel's grand ballroom was a classy venue for the gala."
* Informal: "That new vintage store has some really classy clothes."
* Descriptive: "The sleek, black dress was simple yet classy."
* Complimentary: "You look so classy in that suit."
* Comparative: "The new restaurant is much classier than the old one."
* Negative: "The movie's ending was a bit cheesy and not very classy."
Let me know if you would like to see more examples!