the new black
1 a colour that is currently so popular that it rivals the traditional status of black as the most reliably fashionable colour.
2 something which is suddenly extremely popular or fashionable.
❶ 2003Guardian We've been down this road before, brown is the new black.
❷2011The Age (Melbourne) Because, now that frivolous public liability claims have slowed, corpo bullying has become the new black.