For those of you whose LO's wear the Patagonia Down Sweater coats...is this their warmest coat, or do they have something else for outdoor play? I'm trying to decide if my 17 month old is all set, or if she should have something thicker/more waterproof for the worst days. She does have a snowsuit from REI, but it's a similar thickness to the down sweater. Big sister has another longer down puffer for the most brutal days, so I'm thinking maybe my 17 month old needs this kind of coat, too....advice welcomed! We are still new to this whole winter weather thing!