"Put on some clothes, it's cold!"

I would personally say, "Put on some clothes! It's cold outside!" or "Put on something or you will freeze to death!"

“You’re gonna want a jacket”

Put on a coat, it's cold out. You might want to wear a coat or sweatshirt. You know it's cold outside, right?

1) This is something you'd hear in the morning. Especially if someone is in a hurry. "Get dressed, we're late." 2) No. 3) This one works. 4) Makes little sense. 5) "Aren't you cold?" 6) "You should put on some more clothes or you'll get cold." 7) "You'll get cold wearing that." 8) "Aren't you freezing?" 9) "I'm getting cold just looking at you." 10) "You need to wear something more than just a T-shirt." 11) "Are you Russian?" (joking).