Dress them too much
Obviously, if it is very cold or if you need to protect your dog’s body due to some injury or problem, wearing a coat or appropriate clothing is highly recommended. What dogs hate is that their owners dress them for purely aesthetic and not at all functional reasons. Dogs do not feel comfortable if they cannot walk well or if they have something on them that they cannot take off. Some will learn to tolerate clothes, but others will get nervous and hate being closely watched and drawn attention without understanding what is going on. Even some dogs may not even come close, which causes discomfort in the dog.
Your dog is not a human being, try not to treat him as a human being because it will only create problems. Dress him only when it is appropriate for purely physical and not aesthetic needs with clothes suitable for dogs.