Ive done it too - threw the clothes on the back seat of the car and she was, amazingly, dressed in the 10 mins it took to get to the school gates. Apart from the shoes which I threw out after her and drove off. never happened again.
It was quite funny Discobeaver - school is quite near so I drove slowly to give her half a chance but it was a mad scamble in the back seat as she tried to get things on in time. I'm a cruel heartless mother but sometimes needs must and it worked! oh, and if they won't pick their PJs up off the sitting room floor and take them upstairs, throwing them out of the window is effective too