Deer flies, horse flies, gnats, etc. are all attracted to the lighter, brighter colors. The darker clothing the better during the daylight hours when they are pretty voracious.
Mosquitoes on the other hand seem to be less attracted to lighter colors in the evenings and the wee hours of the mornings.
But with the number of wood ticks I get in the springtime and early summer, coupled with the chiggers I get as the summer dries things out, I just resort to good ol' DEET - - about anything in the 28% to 35% neighborhood is plenty.
Trying to keep 'em all at bay, I reckon...