It's really too bleeping cold to go outside with a three-month-old, but I just got so stir-crazy I had no choice. So Thorsbaby got bundled up with a fleece onesie pajama thing over his regular little warm winter footies, put a hat on him, put him in the stroller and wrapped a blanket around his torso.
Then I put just a light fleece on over my tee-shirt. I figured we'd stay out until I got too cold, and since I'm not dressed as warmly as him, that would be a good threshold. We walked around the block for 20 minutes then came inside. I was freezing, he was quite toasty and snug!