My advice... move lol, just kidding. Our weather has just cooled down and I am so over summer i cannot begin to explain. Sarah was a great inspiration to my summer dressing last summer however I lost the plot a bit this recent summer. My consclusion is 'dresses'. Interesting but cool dresses, and mostly sleeveless. I am searching for dresses that have interesting design features that mimic layers, or have draping, or assymetrical hem lines.
The things I like about dresses, are they are feminine, can be dressed up or down depending on footwear and accessories and they are easy in the heat.

I also live in a place with weeks of 90-100+ heat that comes with plenty of humidity. Sleeveless loose dresses work best. I like them to be of heavy enough fabric that no slip or lining is needed. I find cotton knit hot because it absorbs but doesn't dry quickly. It's very difficult to layer for style when even a necklace feels suffocating. Bangle bracelets that move on the arm aren't bad. Good luck

Thanks so much for the brilliant ideas. When I hear the tank and linen cropped trousers suggestion it brings to mind Alexander Wang, which makes me happy; and now that I have started to look for dresses that feel interesting to me (as opposed to imagining beachy ones that I'd feel silly in) I have started finding some dresses that look cool in both senses.

To the person who mentioned the necklace heat problem -- I know what you mean about necklaces being too hot -- I've had exactly that experience here. So yes, for me I think the solution is to find or make dresses that are sufficiently interesting in themselves to need no extra adornment.

I live in a climate where it is hot and humid. Dresses are my go to item. Bracelets work well for me too. I always have a jacket at work because like Angie the air conditioning drives me crazy. Also my white clam diggers get a workout.

Very very fine cotton has been my solution. No clingy synthetic, spaghetti strap tanks that all the teens wear.