Why two people feel the same weather differently
Body, motion, recent past. Three honest reasons.
Stand at a bus stop with a friend on a 6° morning. You're fine. They're cold. The thermometer doesn't know which of you is right. Both of you are.
Three reasons it happens. None of them are mysterious.
Body
Bigger bodies hold heat longer. More mass, less surface area for the cold to pull from. A taller, broader person at 6° loses heat slower than a smaller person standing next to them.
Muscle helps too. It burns through energy faster, even at rest. People who move more, day to day, tend to feel the cold less.
Circulation matters at the edges. Cold hands and cold feet are usually the body sending blood to the core. If yours go first, that's your body, not your willpower.
Motion
Walking generates heat. Standing doesn't. The same 6° morning is two different temperatures for the person walking and the person waiting.
After fifteen minutes of moving, you're usually about 4 to 6° warmer than the air. After fifteen minutes of waiting, you're about the same as the air.
The last hour
Cold feels colder when you've come from warm. Warm feels warmer when you've come from cold. The body takes a while to recalibrate.
If you walked out of a 22° kitchen, the 6° outside hits hard for the first three minutes. If you've been outside for an hour already, the same 6° feels normal.
Why this matters for what you wear
Forecasts give one number for everyone. The right number is yours. Bigger or smaller. Moving or still. Coming from warm or already adjusted.
Dressed is the small tool that holds those three things and tells you what to wear for the version of the morning you're actually having.