I am from a state that can get very hot/humid, and at those times, a small 9mm Ruger LC9 is my choice. I am wearing docker shorts on those days, and the LC9 conceals well in a pocket holster or Remora holster. Easy on/off, too. The LC9 is a close-quarters weapon for 5 meters or less, IMHO.
My 1911 Bobtail SC is bulkier and less comfortable for carry (grips bite terribly) but also doable in my Milt Sparks VM2. I have an Axiom on order because I seek more cant.