The phrase "smart set" typically refers to a fashionable and sophisticated group of people. However, there are numerous synonyms for this descriptor that could be used to enhance and diversify your vocabulary. For example, you might refer to these individuals as the "A-list," "glitterati," "jet set," or "in-crowd." Other possibilities include "beautiful people," "elite," "high society," or "trendsetters." These words can help to create a more vivid and descriptive picture of the individuals you are discussing. Whether you are writing a novel, a news article, or simply engaging in conversation, it is always helpful to have a variety of synonyms at your disposal.