I agree completely...but you and I aren't from the "tropics," we live in "NORTHERN Kahleeforneeya."
I'm in shorts and t-shirt all the time here, usually from late March to mid November...and no shoes, only sandals/flip-flops.
I know a few Hawaiian natives however who have their heavy winter coats out when the weather gets into the 60's...When we hit Maui in December, the locals often are bundled up like it's sub-zero...and the tourists are still enjoying the weather when it's in the 60's.:biggrin:
In any region during the winter, you can always tell the difference between recent transplants or tourists, and the locals. Locals are typically wearing their warmer clothes for winter, and the non-locals are wearing either light clothing, or are bundled up even more than the locals.
It takes a few years, at the minimum, for the body to really adjust to local climates.
Whenever I see people wearing jeans when it's 90ºF, I kind of start sweating for those people - too heavy of clothing for that weather (and hell, I kind of get used to those temps during the summer)... but some people don't have any problem with dressing like that.
But hell, when we have high summer temps like that, I sweat just standing around. My body refuses to get acclimated to warm weather like that, even being a fit and lean guy.
When I was in S.C. for training one summer, we were all wearing full the full ACU, and I was basically pouring sweat on my face. The guys all said "stop sweating".. and I'm like "how the fuck do I do that?" Shit sucks, I hate when my body just starts making a waterfall on my forehead. But hell, I can do that in the winter too - as soon as I start shoveling snow, drip drip drip.