I was living in Canada when my daughter was of a similar age and my stroller had a matching "sleep sac" that kind of cocooned the child in so you could load them in with just PJs and they would be warm. You would poke the safety straps through openings in the back of the sac and it zippered closed along both sides...similar to this:
View attachment 115575
To me this looks similar to what the pictures show. I wonder if that could mean that the child was found in the stroller wearing PJs but covered, and the snowsuit and shoes "not being worn" found nearby?
The matching hats strike me as odd and perhaps were bought for the sole reason of disguise? I make out the second word as "Law" but the first word is less clear..."West"? WC? WU?
"West Law"
"WC Law"
"WU Law"
Western Uni in Ontario has a Law school...