Definitely no cotton. Once it gets wet (which will take about 45 seconds in humid weather), it might as well be vinyl for all it will breathe.
As loose a knit synthetic as you own. Tighter against your skin is only a problem if the fabric doesn't breathe (e.g. the cooling base layers that are meant to be just as snug as a warm base layer) - it's the distance between fibers in the fabric that you really need to be loose.
And besides the water, be sure to replace electrolytes. You will definitely need to replenish sodium, calcium and magnesium if you'll be out all day in the humidity.



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