Back in 2015, the green cardigan that Cobain wore for the 1993 MTV Unplugged performance sold for $140,800 at auction.

Yesterday (9 October), Rolling Stone reported that the cardigan will be auctioned off again, and is expected to fetch up to $300,000.

The current owner has kept the garment in acid-free tissue in a safe for the past four years to preserve the cardigan.

The cardigan has still never been washed. Speaking to Rolling Stone, Darren Julien of Julien's Auctions said, "It’s very important that we don’t wash it. The stains are still there. There’s even cigarettes burns that you can see on the sweater."

Julien adds, "Rock & roll memorabilia has become an investment. It’s not just a collector’s market — it’s an investor’s market. The person that bought the sweater in 2015 bought it as an investment. Now, because we’ve been getting record prices for Kurt Cobain, people are starting to sell it. We anticipate that it will sell for more than double. I call it the new fine art market. People are investing more and more in pop culture, especially rock & roll. It’s a way to diversify their portfolios."

The cardigan will also arrive with the a handwritten note by Jackie Farry, Courtney Love's close friend and Frances Bean Cobain's former nanny.

Alongside Cobain's cardigan, the auction will be selling a custom, left-handed Fender Mustang guitar that Cobain used on Nirvana's In Utero tour.

Last month, a 25th anniversary edition of Nirvana's MTV Unplugged in New York album was announced. The album will feature rehearsal recordings that were previously only available on the DVD version.

The auction for Kurt Cobain's cardigan will take place on 25 October. Find out more.