Sometimes when I babysit my niece, we like to go out and get the mail down at the end of the street and she likes to stay in her carrier that's attached to me.
I found that this Jolly Jumper Fleece Snuggle Cover is perfect for keeping her warm. It acts like a coat but with none of the fuss and muss that normally babies do when getting outerwear on.
I bought mine when it was closer to $50. I see Amazon.ca has it for $44.99 but Best Buy is selling these for the best price at $39.99.
This will ship for free.