Having 4 kids still in car seats I'll chime in. Kids should not wear any heavy/puffy winter clothes when buckled into their seats. If you get in a wreck the clothing will compress (no matter how tight they "feel" buckled in) and the chances of the seat not retaining them will increase greatly. My wife's as passionate about car seat safety as I am about fuel mileage LOL. Sorry if you didn't want to hear it.
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^ above is done all while pulling a trailer semi-frequently
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