Attire locations are an optional and very easily missable part of Final Fantasy 15 Episode Prompto's open world, which give you new costumes with a range of stat changes.
You can go hunting for them as soon as you have the snowmobile following the Loss of Self mission, with all three appearing inside huts as part of the the northern-part of the map.
Once you have one, simply go into your inventory and equip it like you would costumes in the main game.
If you're after help for parts of the DLC, consult our Final Fantasy 15 Episode Prompto DLC guide and walkthrough.
Goggles On attire location
Head to the lake in the north west (where the Kaiser Behemoth fight takes place) then head south until you see a hut, and the attire will be inside on a crate.
This is not to be confused the shack to the north of the lake containing just weapon racks.
Mask / Googles On attire location
If you go north past the northern-most research facility - which you enter as part of the closing Sins of the Father main mission - you'll find the hut just up ahead.
Hop out and get the attire from the room at the back - it's also worth grabbing the research notes on the table while you are there for some additional backstory.
Need more help? Our Final Fantasy 15 guide and walkthrough can provide tips on main story, as well as the open-world's many quests and activities. Learning how to get AP fast, EXP fast and money or Gil fast will aid you in many optional dungeons and tombs - including how to open and explore their locked doors. There's also plenty of interesting side-quests, too, such as the Scraps of Mystery and Professors Protege frog locations. And if you want to get around easier, you can rent a Chocobo, learn the infinite sprint trick and later in the game, get the flying car Regalia Type F. There's also more to see and do with DLC, such as Episode Gladiolus and Episode Prompto.
Mask On attire location
This is east of the lake and south of the northern-most research facility.
If you go south from the facility and hug the left wall of rocks, it'll eventually open out to a small enclosed region with a hut, with the attire inside.