old, I wouldn't "off body" unless I had no other option. Too many things can go wrong and if they can, they will. I want the weapons with me (retention, wounded drills, ground fighting, etc.), but I was trained old skul and I realize that I am not totin' your pistola for you.
Hot weather is really of no concern. Dress for it, eat for it, and plenty of fluids (beer, even if yummy Fat Tire, does not count).
Of course, I admit I live in a state where open or concealed carrying is permissible. Thus, I have none of the concerns about "printing" that we see more than bear threads.
While most of my carrying has been in a state that could give a gosh darn about concealment (Indiana--dammit, boy, we don't have time to concern ourselves with the likes of you carryin' yur hawglaig, now get out of the police station and go buy another euchre deck. Hurry, the basketball game is on). Recently I did carry on my Florida license in the great Republic of Tejas.
While moseying about Austintacious, Saint Tony's, and Kerrville, I did not wear a big silly hat or pointy elf boots (black suede timerland yuppie scum LPCs), but I did wear a Territory Ahead shirt untucked over my 1911 LB TRS with a white v-neck t-shirt underneath as I am a sensitive man of the new century and don't like holster rubbing against my fish-belly skin no matter how many staff forms I do.
I wore that burnt orange shirt Territory Ahead has which I discovered was the colour of the University of Tejas. During the NCAA basketball game, in the restaurant or tavern guys would slap me on the back (even while having my sushi) and cry out "Hook them". No one "made" me, but they all seemed to be having too much fun. (So was I--will miss Tejas).
You just have to experiment. Part of the fun. Don't forget your lab coat--for science!