The tugging at the sweater itself would not have built nearly enough static to produce an arc strong enough to ignite it.

The video shows the date, it's February 12, no snow, she's a bit cold. That means cold dry air. So, sure the potential required for the static arc goes down, but not enough to spark that.

The car body, on the other hand, 100% had a much higher charge on it from driving at car speeds in dry air, AND she never discharged the car after getting in it and puffing on her cigarette, which, I also can't see, but may have been in her hand for all I know.

You gotta touch the car body when you get out of the car folks, most of you do this automatically when you close the door, which she clearly didn't do.