Blow them away. Almost any breeze — anything above 1 MPH makes it very difficult for mosquitoes to fly. Use fans on a low setting in the evening.
Buy tightly woven duds — particularly high-tech athletic apparel. The tightly woven fabric keeps mosquitos out.
Wear light colored clothes. Mosquitoes use their vision to search for food sources during the daylight hours and light colors are less attractive to them.