I've never understood the stroller. I think these people are missing having a baby around. Unless the dog is injured and immobile, I don't see a reason for them. I know people will say "my dog is too small to take walks", but I disagree. Every dog likes to get out and smell the pavement and bushes. It is good for them to get this kind of exercise.
OhioTom, I know dogs that love wearing clothes. My brother's Yorkie is one of those dogs. I think as long as they aren't confining, they aren't harmful or uncomfortable. Small dogs sometimes need the extra warmth that clothing provides--as do older dogs. But, there is a difference between a t-shirt, jacket, or sweater worn for warmth and tutus and dresses worn to entertain the owner.