I was the type that thought dog clothes were so stupid... until we got Penny and I realized the true need for some dogs. Penny will actually ask for her sweaters when she is cold. And one day when it was cool in the house she kept refusing her t-shirt I was trying to put on her because she wanted a sweater. Then just a few weeks ago I met a lady walking a rescue Yorkie. He is her first Yorkie, and she told me the VET said "If you go outside and need a jacket, so does he."
That clerk was just jealous she didn't have a baby to buy clothes for.