Cuz DH's Mom just rescheduled her wedding due to some crazyness, so I guess we're flying from warm SoCal to freezing MN in early Dec! What do I need to get for a short visit clothing-wise for myself and DS? I don't even have a winter coat

Just a peacoat that can withstand Oregon/Washington style "cold"
Re: I guess I have to go back to carters.com and get some winter stuff!
To quote DH "We will be entering through the garage and not spending any time outdoors" - hahahah! I am def. not used to it. Ooh, I forgot about the scarf. Duh! Thanks
It's true--January is generally WAY worse than December, so it really could be OK when you're here. I wouldn't buy a winter coat just for a weekend in MN, unless the wedding is outside (now THAT would be crazy)!! Wear the peacoat and walk briskly.
You could always get a Once Upon a Child winter coat for LO when you get here...definitely a warm hat and warm shoes/slippers for baby.