So, I studied animal management at college, lotsa great lessons there. Lots of our teachers all had pretty amazing stories to tell, and the lady who taught during my brief time with Wildlife Rehabilitation (Had to be moved out because of some clerical stuff, not because I flunked it), used to work in a Australian rehabilitation centre for wildlife. Apparently, they all wore aprons with large pouches for the kangaroo orphan babies. They would hang them up during their breaks.
So yeah, when you get orphan kangaroos, this is the kind of thing they do to simulate the pouch.