Found this in the web

Wear light-colored clothing: Studies show that dark colors attract mosquitoes because they absorb and trap heat, whereas light colors reflect it. Using their highly sophisticated photosensitive eyes, mosquitoes are able to detect if their target is living by the heat signature they give off.

I know when I worked in Montana if I set a white cowboy hat and black cowboy hat down on a rock the mosquitoes would be all over the black one and none on the white one