The effectiveness of different types of protective clothing commonly used in the agricultural industry during pesticide applications was assessed. A total of eight mixers and 17 applicators working the California citrus groves were studied for dermal exposure beneath protective clothing. The workers wore baseball caps, half mask respirators, neoprene gloves, workboots, 100 percent cotton T- shirts, and 65/35 cotton polyester work pants. The protective garments tested included 50/50 cotton polyester work shirts, 65/35 cotton polyester woven coveralls, and nonwoven coveralls made of untreated Tyvek. The fluorescent tracer, 4-methyl-7- diethylaminocoumarin, was mixed with the pesticide, and the workers' dermal exposure was studied using video imaging and computer analysis. Increased exposures were observed at the sleeve and neck openings of the garments, and the exposures were particularly notable for workers wearing coveralls. Exposure levels decreased with increasing distance from the neck and sleeve openings. All workers also showed exposure to the hand regardless of the use of chemical protective gloves. Hand exposure levels averaged 138 and 58 micrograms for mixers and applicators respectively. A total of 24 of the 25 workers studied showed exposures to areas covered by the protective garments. The rank order of exposure from greatest to least for body part was forearms, torso, and upper arms, and the rank order of protection from greatest to least by clothing type was nonwoven coverall, woven coverall, workshirt.