I think those with big dogs that make fun of people dressing up their small dogs are all lying.
I get request every day for dresses for large dogs and during the winter and holiday season sell just as many items for large dogs as I do for small dogs.
They just won't admit it.
Because there isn't as much for large dogs as small dogs, many will use collars to dress up their small dogs..while not clothing is still accessorizing.
(coming from a person who dresses up their small dog, large dog, and cat!)