What episode is niles dressed as Jesus?

Niles is dressed as Jesus in the "Frasier" episode titled "The 1000th Show," which is the 22nd episode of Season 10. In this episode, the characters celebrate the milestone of their 1,000th radio show, and Niles's outfit becomes a comedic highlight during the festivities. His portrayal adds to the humorous and celebratory atmosphere of the episode.