What is the title of the show's 100th episode?

The title of How I Met Your Mother’s 100th episode is “Girls Versus Suits.”

The episode is the 12th installment of season 5 and originally aired on January 11, 2010. Written by series creators Carter Bays and Craig Thomas and directed by Pamela Fryman, it celebrates the show’s milestone while advancing several character storylines.

The title refers to Barney Stinson’s struggle between pursuing a woman and giving up his beloved suits. Stacy Keibler plays Karina, a bartender whose previous relationships with suit-wearing men make Barney’s wardrobe a serious obstacle. Tim Gunn also appears as himself, helping Barney handle a suit emergency.

“Girls Versus Suits” is especially remembered for the musical number “Nothing Suits Me Like a Suit,” performed by Neil Patrick Harris as Barney. The production used 65 dancers and a 50-piece orchestra, and the song received a Primetime Emmy nomination for Outstanding Original Music and Lyrics. Viewers sometimes confuse this milestone with “The Playbook,” but that episode is the 96th overall.