3. Tivoli Couture. You folks with older kids just turn around. This is for the itty bitties. I had this for belle and its great. It essentially goes around the top of the infant seat and keeps them warm all the way around. Lots of companies make them at different price points. JJ Cole (please not the old style one its just for strollers), 7am Enfant, and you can even find non brand name ones at Target and Babys R Us.
5. North Face, Columbia, LL Bean and any of the cold weather gear companies make fleece long all outfits that are thin enough to be car seat safe but are still warm. No puffers folks. Unfortunately, they don't often make them beyond 2t, so for those of us with older kids, we have to look harder.
I wont overdo that it is important to put your child in the correct carseat gear. Look, we all know car safety is important. Thats why we spend SO much money on those seats in the first place. Let's just not negate all of the benefits of that amazing seat by putting them in something that isn't safe, MmmKay? Here is some information from the Car Seat Lady if you want to read it. Good luck and stay safe out there.