How to get the warm doublet
If you want the hot double before heading to the snowy area to tackle the two shrines there, you must make a spicy meat and seafood fry for the old man. If you complete the shrines without it, you will find the doublet in the Old Man’s Hut, but it is much more convenient to collect it beforehand.
Read the newspaper in the Old Man’s cabin and you will discover a partial recipe. It turns out that he will give his warm doublet to whoever discovers the missing ingredient.
The three ingredients are hot pepper, raw meat, and Hyrule sea bass.
The pepper can be found growing near the entrance to the snowy area at the end of the path from the Shrine of Resurrection. There is a Bokogoblin camp to the right of the arch and here you will find a pepper plant.
Fish can be seen swimming in the lake next to the Temple of Time. You can shoot them with an arrow and dive to grab them, swim over them and grab them, or drop a bomb into the water and dive in to retrieve their bodies.
The Forest of Spirits is home to several wild boars. The easiest way to kill them is with a well-placed headshot. Otherwise you can try to sneak up on them, but be careful, they are frivolous bastards.
Once you have prepared the dish, you should introduce it to him when he is resting by a campfire at night and tell him that you cooked something.
Hand over the plate and the warm doublet is yours.
Next: Oman Au Shrine