The Brave Vest is an Avatar Award in Half-Minute Hero: Super Mega Neo Climax. It can be acquired by finishing any quest after Quest 3 ("Caves and Forests") in under 30 seconds. The Brave Vest is a full outfit, and is available for both male & female avatars.
Quest 7 in the southern route, "Good Ol' Days", is an ideal level to first try under 30 seconds.