Do you get pills on your clothing? Knits in particular can pill easily and leave nasty little bobbles, particularly on areas that rub, under arms, sleeves and across your breast where the car seat belt cuts your body.
There are great little lint shavers that you can use to de-pill, but to stop them from appearing on your clothes, you may want to take preventative steps such as getting a seat belt shoulder pad, but rather than wear it over your shoulder, put it between your breasts where the seat belt rubs your clothes.