How about any of the following:
- clique, or cliquish
clique, or cliquish
- clan, or clannish
clan, or clannish
- snobby
snobby
- pompous
pompous
- pretentious
pretentious
- highfalutin
highfalutin
- society's crème de la crème
society's crème de la crème
- upper crust
upper crust
- aristocracy, aristocratic
aristocracy, aristocratic
- a monarchic (or monarchical) group
a monarchic (or monarchical) group
- high society
high society
- haut monde or grand monde
haut monde or grand monde
- coterie
coterie
- nouveau riche
nouveau riche
