"Love Dress" joke

A mother-in-law stopped unexpectedly by her son's house after he was recently married. She rang the doorbell and stepped into the house to see her daughter-in-law standing naked by the door.
"What are you doing?" the mother-in-law asked.
"I am waiting for my husband to come home from work," the daughter-in-law replied.
"Why are you naked?" asked the mother-in-law.
"This is my love dress," the daughter-in-law replied.
"Love dress? You are naked!" said the mother-in-law.
"But my husband loves it when I wear this dress. It makes him happy, and he makes me happy. I would appreciate your leaving now because my husband will be home any minute."
Soured by all of this romantic stuff, the mother-in-law left. On the way home, she thought about the "love dress" and got an idea. She undressed, showered, applied her best perfume, and waited by the door for her husband to come home.
Finally, the pickup truck pulled into the driveway, and she took her place by the door. The father-in-law opened the door and immediately saw his wife naked by the door.
"What are you doing?" he asked.
"This is my love dress," the mother-in-law replied.
"Maybe you should iron it first," he said.