I've never let DS wear a coat in the carseat as I'm aware that it can reduce impact protection in a crash. Ds has now outgrown his 0-4 seat so just bought the Cybex Solution T I-fix which doesn't have a harness and you buckle them with a normal seatbelt (secured tightly through the anchor points).
Is it now safe to assume that, since he's not using a harness type belt, that DS (who is 4.5 y/o) is safe to wear his coat?
YABU - it's still not safe
YANBU - coats are fine in this type of car seat.
TIA