Achievement Unlocked: Buying a costume that has nothing to do with the actual show. You spent fifty-nine dollars on a polyester jumpsuit from a seasonal pop-up store and think you earned a crawl. Here are the facts.
Spirit Halloween is selling an official Dungeon Crawler Carl costume for $59.99. IGN reported the price and the existence of the costume. That is the entire story. There is no mention of who designed it, what materials were used, or whether the store had to license anything from Matt Dinniman. The costume exists. It costs money. You can buy it. For the same amount of effort, you could read Book Six Review: The Eye of the Bedlam Bride Barely Worth Your Time and learn what the actual story is about, but you will not do that because you are here for the costume. Meanwhile, Audiobook Narrator Explains Why Princess Donut Is More Than a Joke exists to remind you that a character who matters in the books now has a casting credit in the show, and you are out here buying a generic orange vest.
The practical consequence for readers is that you now have a way to look like a crawler without reading a single page of the books or listening to a single hour of Jeff Hays's narration. That is the point. Spirit Halloween does not care about the dungeon. Spirit Halloween cares about the window between the announcement of the Peacock show and the release of the show itself. The costume is a placeholder for hype. It is the same cardboard standee they would put out for a cancelled Netflix adaptation. The real news is that Jeff Hays to Voice Princess Donut in Show After Fan Demand means the show has a concrete voice actor attached, which is more substance than anything Spirit Halloween has produced. The costume does not come with a cat. It does not come with Mongo. It does not come with a loot box. It comes with a price tag and a plastic badge.
The takeaway is this: if you wear that costume to a convention, someone who has read the books will ask you what floor you are on, and you will have to answer with a lie. That is your problem, not ours.