Upper-Crust Meaning

(idiomatic, informal) Posh, upper-class; pertaining to the upper crust.

Example:   An upper-crust London party.
  They're aiming for a more upper-crust clientele.
1989, Roy Thomas, Japan: The Blighted Blossom, page 172,
  In 1986, Takako Doi was elected leader of the Japan Socialist Party; another woman is the president of Takashimaya, Japan's most upper-crust department store chain.
1993, Alice Adams, Almost Perfect, 1998, page 192,
  But Prentice had grown up richer and more upper-crust than Richard had any idea of.
2013 October 13, Erik Adams, “TV: Review: THE SIMPSONS (CLASSIC): “Lisa’s Wedding” (season six, episode 19; originally aired 3/19/1995)”[1], The Onion AV Club:
  Patinkin’s melodious voice is a natural fit for animation, and he breathes just the right type of upper-crust life into Hugh in 22 short minutes.
2012, J. A. Jance, Left for Dead, page 43,
  That was another story, and the retirees who frequented the relatively lowbrow kino Ridge were more likely than the more upper-crust folks at Amado or Rio Rico to shut up and pay their fines than they were to hire criminal defense attorneys.