It is illegal to change clothes in a vehicle unless you have drawn the blinds.

The Law Explained

Dating back to the early days of the automobile, cars were seen as mobile private spaces that threatened public decency. To prevent citizens from accidentally or intentionally flashing pedestrians, the state mandated that any in-car wardrobe changes must happen behind drawn curtains. Since modern cars rarely come equipped with window blinds, changing in your backseat is technically always a risk.