Castiel's trench coat

Castiel's trench coat is an article of clothing Castiel is fond of.

Original version
Pontiac resident Jimmy Novak owned a beige trench coat. After being spoken to by the angel Castiel, Jimmy put this trench coat on and walked outside his house, and offered his services to the angel in exchange for protection of his family.

Castiel took possession of Jimmy, and kept the trench coat on. He has repaired it on numerous occasions when damage was inflicted, such as by the demon-killing knife when he first approached Dean Winchester.

After his first two resurrections, Castiel still wore the trench coat. He lost it after the Leviathans he was housing inside his vessel erupted out of him, destroying his vessel, but sparing the trench coat, which was picked up by Dean.

Dean kept the trench coat mostly in the trunk of the Impala, but also in any stolen vehicle he drove. After Castiel was resurrected a third time, Dean returned it to him. Castiel wore it all throughout the Leviathan outbreak and his time in Purgatory, during which it became noticeably dirty and worn out.

After being turned into a human by Metatron, Castiel took off his clothes for wash, but ultimately chose to use what little money he had to buy food, which led him to abandon the trench coat.

New version
Castiel eventually replaced his beige trench coat with a darker and more simpler trench coat. Lucifer, while possessing Castiel, kept this treach coat on, and even after leaving it in the Men of Letters bunker due to being banished by Sam, he found an identical one and wore it, which was also kept by Castiel himself.

Trivia

 * Metatron was shown wearing a trench coat similar to Castiel's new one in Stairway to Heaven.
 * The reason why the old one was replaced was because Misha Collins, the actor who portrays Castiel, was tired of wearing the same thing all the time.
 * Castiel referred to his trench coat as an "overcoat".
 * Eric Kripke gave Castiel the trench coat so he would resemble comic book character John Constantine, who was also a trench coat wearer.
 * Many of the trench coats were stolen, along with Dean's Leather Jacket, prior to the promo shot for season 6.