One of the random locations of Jason's House on the Higgins Haven Map to give you an idea of what you are looking for.
1. Load up a Private Match with a friend choosing a Female Counselor
Choose from: (which ever one is available if you haven't Leveled up)
Vanessa Jones - Available at start
A. J. Mason - Unlocks at Level 4
Jenny Myers - Available at start
Tiffany Cox - Unlocks at Level 18
Deborah Kim - Unlocks at Level 6
FOX
2. As the Female Counselor Find a map (which spawns in random locations) by searching the drawers in cabins or on a sign outside that says MAPS use the back button to bring up the map once you have one (***Finding a map is optional just makes it easier to get where you need to go when Jason is guiding you***) and have Jason tell/guide you to his house where he starts every time the game begins. Jason will have a map available as well and can be accessed using the button as well.
3. Enter the house and walk up to the middle of the room on the shrine and grab the shirt when prompted by pressing the
A button.