
Among the many collectibles you can obtain in Hell is Us are baseball caps. These items provide no defensive benefits and are purely cosmetic, and they're exactly what their name suggests: simple caps that you can equip from the Loadout > Cosmetics menu and change whenever you like. Bear in mind that there's an achievement/trophy for collecting and wearing every cap at least once, so make sure you switch to each new one you find.
Available by default, Rémi wears this cap from the beginning of the game.
This cap can be found at Lake Cynon. From the starting area, continue to the picnic area and go down the stairs to the flower field. Continue until you reach the first junction, where the path carries on straight ahead or turns right, then look to your left to see a hill that appears to lead into the forest.
Climb the hill, turn right and keep an eye on the right-hand edge of the elevated area. You'll see a glowing backpack containing the cap.
This cap can be found in Talju. To reach it, head to the Vanderlyn Trust building and follow the street north. You'll soon see a barn on your left.
Go around the barn and enter through the rear door. Climb the ladder to find the cap upstairs.
This cap is obtained by completing the Lost Keys Mystery.
This item is obtained as part of the Suspicious Activity Mystery.
This cap can be found in the Ministry of Cultural Primacy parking garage. Just before heading up the stairs from the parking area, look beneath the stairwell to find the cap.
This cap can be found in Serpent's Maw, while searching for the Token of the Moon. Since this entire section is extremely labyrinthine, we recommend following our walkthrough for the area to find it. It is located within a network of tunnels in the hill northwest of the Token of the Moon door.
This cap can be obtained in Jeljin. First, you'll need to collect the Crane Keys. They are in the enclosed yard beside the church. Enter through the church's front door, leave through the rear, turn right, climb the scaffolding and cross the roof. You'll find the keys on the body inside the enclosed yard.
Now continue until you've made your way through the excavation site. You'll emerge in the area west of the church, where you'll see the crane that can be operated using the keys.
Use the key, press the switch, climb the scaffolding, cross the beams, continue upwards, defeat the enemy and open the door. Return to the crane and activate it again to raise the beams, then head back through the door you just opened and voilà: you'll be able to reach the top of the scaffolding, where the cap awaits.
This cap can be found in the room associated with the Captain's Office Mystery.
This cap can be found in the final Timeloop area of the Eye of God.
Look on one of the tables south of the Timeloop to find it.