bon ton

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A sophisticated manner or style.
2. n. The proper thing to do.
3. n. High society.

Century Dictionary and Cyclopedia

1. n. The style of persons in high life; good breeding.
2. n. Polite or fashionable society.

Wiktionary

1. n. dated The height of fashion; fashionable society.

GNU Webster's 1913

1. The height of the fashion; fashionable society.
2. n. See in the Vocabulary.

WordNet 3.0

1. n. the fashionable elite