About cannibalism and red shoes, a connection of some sort goes back centuries.

Let's take a look at the Grimm's fairy tale The Juniper Tree.

https://en.wikipedia.org/wiki/The_Juniper_Tree_(fairy_tale)

http://www.surlalunefairytales.com/authors/grimms/47junipertree.html

In the fairy tale the significance of the little girl being gifted with the red shoes for her part in the cannibalistic sequence of events is left unclear and seems like a random reward much like the gold chain. However the modern usage suggests that there is hidden symbolism behind the choice of the item if the usage did not originate from this fairy tale.

I can see Masonic symbolism in the goldsmith coming to see the bird wearing only one shoe. The bird itself resembles the phoenix, which is also a Masonic symbol. The child victim being described being while alive "as white as snow and as red as blood" reminds me of the red and white being the spirit cooking colors also seen on international barber poles.

The English fairy tale The Rose Tree is a variant that apparently descends from a common ancestor. The Rose Tree shares with The Juniper Tree the cannibalism and the red shoes, as well as elements such as the gold chain (here combined with a gold watch) and the millstone as the other two things acquired by the bird.

https://en.wikipedia.org/wiki/The_Rose-Tree

I made the fairy tale connection when I saw a translation of The Juniper Tree printed among more usual fiction.