I can just imagine this discussion:
"BOYS! WHERE ARE YOUR TROUSERS?!"
"But Mummy. You're not wearing trousers. We thought perhaps we needn't wear trousers, Mummy. It's so very hot."
"I'M WEARING A DRESS."
"Mummy? But it doesn't cover your bum, Mummy? Don't you need pants, Mummy?"
Answer us that, Vicki.