"BYING A BRA" joke

A married man thought he would give his wife a birthday surprise by buying her a bra.
He entered a ladies shop, rather intimidated, but the salesgirls took charge to help him.
"What colour?" they asked. He settled for white.
"How much does it cost?" he asked.
"Twenty-four dollars."
"Expensive, but ok," he thought.
All that remained was the size, but he hadn't the faintest idea.
"Now sir, are they the size a pair of melons? Coconuts? Grape fruits? Oranges?"
"No," he said, "nothing like that."
"Come on, sir, think. There must be something your wife's bust resembles."
He thought long and hard and then looked up and said, "Have you ever seen a Spaniel's ears?"