Does your mother have a wig? You can roll up your pants or use an older pair and cut them at the knees for the knickers, wear some long white socks pulled up to the knees. You could use a white shirt put the head opening around your head and flip the shirt part back over your head and pin it up to give yourself the wig look. If you are trying to accomplish this without spending any money this is a good place to start. If you experiment starting with the above I am sure you will get the imagination flow to put you in the mood of President Jefferson.