Daredevil gets his new red suit at the end of Season 1, Episode 13 of the Netflix series, which is the finale. The suit first appears in the final moments of that episode.

Episode note

  • If you mean the yellow MCU suit , that shows up in She-Hulk: Attorney at Law, Episode 6.
  • If you mean the new red suit in the MCU , he has a red suit in Echo , though it is a different version from the classic Netflix one.

TL;DR

The iconic suit appears in the Season 1 finale of Daredevil.