Clothier

The Clothier is an NPC who sells vanity items to the player. One of the things he says when you talk to him is "Thanks again for freeing me from my curse. Felt like something jumped up and bit me." This confirms that he is the Old Man from the dungeon. He will come to town after Skeletron is defeated, and only if there is an empty home. He drops the red hat upon death, and this is the only way to obtain it.

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Trivia

 * The section of the quote: "Felt like something jumped up and bit me" is also from Forrest Gump. On a similar note, this may have been how he got cursed, It may have been a corrupted Bunny, or a teaser for a new enemy type
 * "The Ladykillers" is a 2004 movie with Tom Hanks.
 * If talked to while wearing his Red Hat, he only says "That Red Hat of yours looks familiar..."
 * The quote; "Player name... we have a problem!" is a reference to the 1995 film "Apollo 13" (also starring Tom Hanks).
 * Before the 1.0.5 patch, the Clothier sold the Plumber's Shirt and Plumber's Pants rather then the Familiar Clothes
 * If you look at his face after he dies, you will notice that his eyes turn red.
 * As the "Old Man" NPC, he has red eyes, but as the Clothier, he has blue eyes. This is likely a result of him being freed from his curse.