Always with unless there is a climate related reason not to. Being both large and tall (6'5" 280#) I find it helps hide the gut effect well and, becasue most ties are too short for my torso, gives me a convenient place to tuck in the otherwise short tails of my tie. And I think it just gives a better look of a big guy like me in general to break up the large field of color afforded by a jacket and kilt and hose.