I dont know if it is in here already, (i didnt read all the post
) and i dont know if its an USA thing but under armour heat gear is amazing!
http://www.underarmour.com/shop/us/en/ua-heatgear/womens#products
They make it so it can breathe in the hot sun and stuff, i worked at a place that sold it and tho it is expensive its works well and can be worn with out getting to hot.