wool, too, when thin, is cool, not warm.. i have had summer dresses made fromm hankerchef weight summer wool... wool so light weigth, it was so sheer it needed a lining! the lining was light weight cotton.. and everyone was flabergasted that my dress was wool! but wool, like cotton and other natural fabrics is superiour at wicking away moisture so it felt cool. and it was hand wash in cold water and wear -- hung to dry, it didn't need ironing..(the lining was seperate, so it could go in the machine.)

we forget, in days past, with out centeral heating, it was not uncommon for dressy evening dresses to be made from wool.