To get the golden armor in Sons of the Forest, you need to get the maintenance keycard first. The bunker where the armor is located is on the east side of a lake east of the snowy mountains. Prepare yourself for enemies before entering.

Enter the bunker and find an opening in the floor. Go down the stairs, use the keycard to open the door, and proceed to the bottom of the staircase where you’ll find another door. Opening it triggers a cutscene, and you won’t be able to exit the way you came.

Move forward, pass two open doors, and enter the one straight ahead. There are various items in the rooms, so explore and grab what you need. Go down to Level 2, skip the first two open doors, and enter the third one to find the golden armor on the couch.