Backrooms is the horror hit of 2026: Kane Parsons' A24 film, made for $10 million, grossed more than $400 million worldwide. It also gave Halloween two easy costumes. The first is the yellow Async hazmat suit that the Backrooms explorers wear. The second is Pirate Clark, the film's nightmare of a monster, who is a distorted copy of a furniture-store mascot. You can go as either, or bring both and let the pirate chase the explorer.
How to Make Backrooms Explorer Hazmat Suit Costume
Yellow Hooded Hazmat SuitYellow Hazmat Coveralls with Gloves and Shoe CoversBlack Full-Face Gas MaskLong Black Rubber GlovesBlack Rubber BootsBlack Gaffer TapeBlack Hard CaseLED FlashlightSaveTap any item in the photo to shop itClick any item in the photo to shop it
| # | Item | Description | Shop |
|---|---|---|---|
| 1 | Yellow Hooded Hazmat Suit | A one-piece yellow suit with a hood and a dark visor panel, close to the Async research suits in the film. | 🛒 Check on Amazon |
| 2 | Yellow Hazmat Coveralls with Gloves and Shoe Covers | The cheaper option: plain yellow coveralls that come with black gloves and shoe covers. Add the tape marks below to make it an Async suit. | 🛒 Check on Amazon |
| 3 | Black Full-Face Gas Mask | For the explorers from Kane Parsons' original videos, who wear a black respirator under the hood. This is a costume prop, not a real respirator. | 🛒 Check on Amazon |
| 4 | Long Black Rubber Gloves | Long black rubber gloves to match the black gloves on the suits. | 🛒 Check on Amazon |
| 5 | Black Rubber Boots | Plain black rubber work boots. | 🛒 Check on Amazon |
| 6 | Black Gaffer Tape | The Async suits have dark slots across the chest and thighs. Stick short strips of black tape on to copy them. | 🛒 Check on Amazon |
| 7 | Black Hard Case | A black hard case to carry. The Async researchers in Kane Parsons' original videos carry one. | 🛒 Check on Amazon |
| 8 | LED Flashlight | A handheld flashlight for the dark corners of the party. | 🛒 Check on Amazon |
The suit is the whole costume, so make it look worn. The film's practical suits are bright yellow-green with a big hood and a dark visor, black gloves and black boots, and black slots on the chest and thighs. In Kane Parsons' videos, Async's supervisors wear a lime-green suit, so if you're going with a friend, one of you can be the boss.
Safety note: A hazmat costume and a costume gas mask are only costumes. They don't protect you from anything, so don't wear them for painting, cleaning or anything that needs real protective gear.
How to Make Pirate Clark Costume
Black Tricorn Hat with White FeatherMustard Yellow VestSage Green Lace-Up ShirtWide Black Belt with Gold BuckleGray Waist SashBrown Pirate PantsBlack Full BeardCoagulated Fake BloodChunky Gold RingsPirate Peg Leg SocksSaveTap any item in the photo to shop itClick any item in the photo to shop it
| # | Item | Description | Shop |
|---|---|---|---|
| 1 | Black Tricorn Hat with White Feather | A tricorn pirate hat with a tall white plume. Pirate Clark's is dark brown; black reads the same in low light. | 🛒 Check on Amazon |
| 2 | Mustard Yellow Vest | A mustard vest with buttons down the front and gold trim. It's the biggest patch of color on him, so choose yellow. | 🛒 Check on Amazon |
| 3 | Sage Green Lace-Up Shirt | A loose shirt with puffy sleeves. Pirate Clark's are a pale sea green, and a muted sage or army green is the nearest common color. | 🛒 Check on Amazon |
| 4 | Wide Black Belt with Gold Buckle | A wide black belt with a big gold buckle, worn over the vest at the waist. | 🛒 Check on Amazon |
| 5 | Gray Waist Sash | A wide gray sash wrapped and knotted at the waist, under the belt. | 🛒 Check on Amazon |
| 6 | Brown Pirate Pants | Loose brown pirate trousers. | 🛒 Check on Amazon |
| 7 | Black Full Beard | A thick black beard that covers the jaw. Pirate Clark's is full and unkempt. | 🛒 Check on Amazon |
| 8 | Coagulated Fake Blood | Thick scab blood for dried smears on the face, the neck and down the front of the vest. | 🛒 Check on Amazon |
| 9 | Chunky Gold Rings | Big gold rings on every finger. His hands are long and knobby, and covered in rings. | 🛒 Check on Amazon |
| 10 | Pirate Peg Leg Socks | The film's creature has a peg leg. A wood-print peg leg sock is the easy version. | 🛒 Check on Amazon |
Pirate Clark is what the Backrooms make of Clark's furniture-store mascot outfit: a tricorn hat, a mustard vest over sea-green sleeves, a wide belt over a gray sash, and a face that's wrong. Wide eyes, a black beard and brown dried blood do most of the work.
Getting the details right
The height is what makes Pirate Clark frightening. Robert Bobroczkyi, who plays the creature, is 7 feet 7 inches tall, and the film builds the monster from a practical costume and a heavy mask, with digital work on the face and peg leg. You won't get that tall, but you can stand at the far end of a hallway, lean forward and keep your head tilted. Keep your eyes wide and your smile stuck.
For the makeup, use a pale, slightly dull skin tone with brown blood. The film's blood is dried, not fresh: smears at one temple, on the neck and down the vest. Dab the coagulated blood on with a sponge and don't overdo it.
Backrooms costume ideas for groups and couples
- The explorer and the monster: one person in a yellow suit, one as Pirate Clark. It's the film in two costumes.
- An Async team: three or four yellow hazmat suits with black cases. Add one lime-green suit for the supervisor.
- Clark and his therapist: one of you as Clark in his mascot pirate costume from the commercials (the Pirate Clark outfit without the blood and makeup), and one as Dr. Mary Kline, played by Renate Reinsve, in a blazer.
If you're looking for another of 2026's big horror costumes, try Nikki Freeman from Obsession. The yellow hazmat suit also works for the cooks in Breaking Bad, so see our Walter White costume.
About Backrooms
Backrooms is a 2026 horror film directed by Kane Parsons, who made his name with the found-footage YouTube series it's based on, and written by Will Soodik. A24 released it in the U.S. on May 29, 2026, after a premiere on May 7. It cost about $10 million and has grossed about $402.5 million worldwide, the highest of any A24 film.
Chiwetel Ejiofor plays Clark, a furniture store owner and failed architect who finds a portal in his showroom's basement leading to an endless maze of dull yellow rooms, buzzing fluorescent lights and long corridors. He tells his therapist, Dr. Mary Kline (Renate Reinsve), and the two go looking. The cast includes Mark Duplass as Async scientist Phil, Finn Bennett as Bobby, Lukita Maxwell as Kat and Avan Jogia as Naren, an Async explorer.
Clark is shown wearing a pirate mascot costume in commercials for his showroom. The Backrooms copies it, and that copy is Pirate Clark, played by Robert Bobroczkyi, who also played the Offspring in Alien: Romulus.
