>>108993380Same reason she wears her pearls.
Because that's what her mom wears... and what her mom buys for her.
Probably would have been wearing the dress there, too... had the writers not realized it would be silly for her to be outside washing the car while wearing it.
She gives up the dress eventually as she gets older and has more say in her wardrobe.
The pearls, however, remain a fixture.
