Dressing modestly in the summer?

I am hoping for some practical advice about dressing modestly in the summer heat. I've searched a few articles and mostly they only say dress modestly or stay inside, but don't really give specific suggestions. Few things that I am wondering, are for example: 1. What are good fabrics for clothing to wear in the heat which are lightweight and cool but also do not see through? 2. For wearing hijab in the summer, are there styles meant to wear that won't add too much insulation and heat to the head while one is outside in the sun? 3. For exercise in the summer, are there some suggestions on modest workout clothes? Thank you for any thoughts.