Animals aren't here to be mucked about with. We don't know if they like it or not, so why not just steer clear of putting clothes on them, then you're not hurting them in any way. I hate how so many people dress their animals up, the animal doesn't speak the same language and therefore can't tell you to stop it! It makes me furious seeing pictures of any animal with a costume on - grrrr.
I've seen so many times as well, in the headlines they always have some sort of news report on a celebrity and in those photos they have their little dog stuffed in a handbag wearing silly unnecessary clothes. It's unnatural.
I tried taking a photo of one of my dogs with a little hat on (I only rested it on their head for a few seconds) and they shook it off and I never put it on them again! The nearest I go to dressing them up is putting a little ribbon on their collars when I'm doing a heelwork to music routine.