Unlock these costumes for Alex after beating these certain endings.

Costume	How to Unlock
Bogeyman a.k.a. Pyramid Head Helmet	Unlocked by getting the "Bogeyman" Ending
Deputy Alex	Unlocked by getting the "UFO" Ending
Order Soldier Outfit	Unlocked by getting the "Drowning" Ending
Orderly Alex	Unlocked by getting the "Hospital" Ending
Trucker Alex	Unlocked by getting the "Good" Ending