Actually, on a more serious note.
When we lived in a very cold country, the children had no choice. They had to wear full on sleepsuit/snowsuits, tights, trousers, oversocks and fur lined boots.
They had to wear gloves, hats that come down under the chin, and scarves tied on backwards so it was a thick strip over their mouth, nose and chin.
Even aged 6, and knowing it was very, very cold outside, my kids insisted they were warm enough and didn't need to put on these clothes. I do think that until they can FEEL the cold, they don't really believe you, I once heard it said "Your body has no memory, which is why you end up taking a jumper on holiday, your body can't imagine not needing it"
I used to open the front door, so that the freezing air from the stairwell came in, and we would stand in the doorway for a moment, and then I would start getting them dressed in the extra layers. As soon as they felt the cold air on their face, they were willing to put on warmer clothes.
I sometimes do it now with dd - go out of the back door for a minute without your coat while I put my coat on. She does, and is then much more willing to put on her coat.