Merriam-Webster says:

Main Entry: ritzy 

Pronunciation: \ˈrit-sē\

Function: adjective

Inflected Form(s): ritz·i·er; ritz·i·est

Etymology: Ritz hotels, noted for their opulence

Date: 1920

1 : snobbish
2 : impressively or ostentatiously fancy or stylish : fashionable, posh

— ritz·i·ness noun