I have always just kept the car so toasty warm, that no one needs anything more than a shirt while in it

I am a tiny person, so I am cold a lot, so I just crank the heat and no worries that my baby will be cold. Also, Ty and all my kids have always loved blankeys so I keep a pile of blankets in the car year round in case they are needed. I have never used a coat on any of my kids in a car, whether they are in a carseat or an older kid/teenager.