dernier cri

plural derniers cris

1. The latest sensation; the last word, the newest or ultimate expression or example (of something).

   I once named it Lamb Dressed as Mutton, but now I think I prefer Wifely Chic - whatever, it's the dernier cri in unthreatening, cheerful, prim and demure.

   2006 December 31, Polly Vernon, “Jigsaw girl is no fashion icon”, in The Observer

   1 more example

   Here and there were certain unmistakable derniers cris, some of them undoubtedly destined - had the world pursued its expected course - to become the rage of tomorrow; others, I would say, a dead loss from their very inception.

   1951, John Wyndham, The Day of the Triffids, Harmondsworth: Penguin Books, published 1954, page 82