Great post buzz.I bought my jacket back in feb.Chose black leather lol, and iv worn it daily.Like you said, if its hot, its hot.Im going to get sweaty regardless, so it might as well be worth a shower.I honestly think it helps block out the heat as well.Air conditioning wont cool a car down, while the windows are down.In high heat your body wont cool unless it has a barrier from the heat.When im moving im usually fine as long as Im hydrated, its being stopped, and not having the extra air to help radiate my sweat away that sucks.
I guess im trying to say gear offers shade, you just have to keep air circulating to avoid heat build up.
It wont work in a black jacket, but dont they wear black robes in the middle east sometimes because black absorbs heat better, the absorbed heat sets up convection currents.Warm air rises and leaves the top of the clothing and this is replaced by cooler air which enters the bottom of the clothing.It's like a solar powered fan?I understand white is worn more, but wont white help trap your own heat to?If sealed off tight like a jacket, instead of being loose like a shirt or robe.
My black leather feels lethal at stoplights, but in the long run, I do feel cooler when I take my jacket off, and I can feel the heat it "blocked and stored" when im carrying it.So I believe that if I didnt have my jacket on, the heat would of built up in my body instead.Feeling cooler when you take it off is an illusion imo, and id be just as hot without it if not worse.Exposure is what overheats you, a jacket minimizes exposure.You just have to rest before the heat the gear absorbs, radiates into your body.
Shorts and a tshirt your body is immediately exposed, and immediately gains heat.Just my .02
Edit.The other day I rode my bike to visit friends that were camping.I was dripping sweat upon arrival atgatt.After taking my gear off, immediately after the ride.A bottle of water later I was the only person that wasnt sweating.I think its because of the heat I ditched taking my jacket off, just as much as the water I drank that cooled me down.They were in shorts, drinking just as much, but I was cooler and had more energy