Brown latex gloves and other brown disposable gloves are not a common color, but we have some. They are often chosen for their color because people like how they look.
Brown latex gloves are not as good at showing punctures as purple disposable gloves or black disposable gloves, but they do show them. Perhaps try a purple nitrile glove or black nitrile glove if you are really concerned that you will see tiny punctures from pokes and prods in your industry or activity. The brown colors is usually cosmetic.