Gear #4 - Legs
The Arcade - on a table inside a room designated for employees only. You can visit this room on your way to the arcade.
Gear #5 - Head
The Arcade - received from a young couple near the "Colored & Irish" washrooms. You will meet the couple only if you didn't throw a ball at them in chapter 3.
Gear #6 - Torso
Patriot's Pride Pavilion - on a desk in a locked office located to the left of the elevator.
Gear #7 - Legs
Soldier's Field - behind a closed door in the "employees only" section of the ticket hall's ground floor.