Don't forget to check your Twitter feeds on Monday night, Castle fashion fanatics. Costume designer Luke Reichle, the mastermind who outfits every single character on the show, will be live-tweeting throughout the entire episode.

"Yes, we've wrapped camera on Season 4 of #Castle BUT don't fret tweetlings! I"ll be live tweeting episodes 422 and 423!" Luke tweeted.

You know what that means — insider info on all of Kate Beckett's designer trench coats. And perhaps some cool fun facts about how he outfitted all those extras playing flesh-eating zombies!

Tune in to Season 4, Episode 22: "Undead Again" on Monday, April 30, 2012 at 10 p.m. ET on ABC.

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