In addition to the 3" folding Gerber (20+ years old, from back when Gerber blades were good) that clips in my right front pocket, I have a 2 1/2" fixed blade Cold Steel Tanto that I wear suspended from my neck via GI dog-tag chain.
I seldom tuck a shirt in (CCW in play) except on Sunday mornings, so I can retrieve the knife pretty quickly from under a t-shirt. If wearing a button-up shirt, I can easily retrieve it from between the top shirt and under shirt.
I am considering one of those "ink pen shaped" stabbing tools to carry in a shirt pocket as well.