The Core is a total conversion single-player mod for Half-Life. Survive the disaster as Maurice Andrews, a low level engineer stationed in Black Mesa during the events of the resonance cascade. Seemingly trapped, Andrews must fight his way to the surface to survive.
While that baby vest does in fact exist, I'm sorry to say that it is a one of a kind and you can't have one. :P
Design by Eva Logan: Evalogan.tumblr.com