An all-time classic: According to biologists, the function of zebras' stripes is to ward off insects. Based on that idea, a team of scientists painted zebra stripes on cows. This reduced the number of biting flies on the cows by more than 50%. https://realclearscience.com/quick_and_clear_science/2019/10/07/painting_zebra_stripes_on_cows_wards_off_biting_flies.html

Were the flies just repelled by the paint? Apparently not. When the cows were painted with black stripes only, there was little reduction in the number of flies. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0223447

What other animals achieve through biological evolution, humans achieve through culture. "[W]hite-striped bodypaintings, such as those used by African and Australian people, may serve to deter horseflies." https://royalsocietypublishing.org/doi/10.1098/rsos.181325