
The main thing I learned from that first kangaroo costume was that in subsequent costumes not to include feet. I didn't expect my kids to wear their costumes over multiple years (and for any and every occasion), but they do, and room for added leg growth has proven necessary.
So as much as Aden liked being a snowy owl last year, and a zebra the year before, she really liked her kangaroo costume from the year before that and decided to wear it again. It just needed a few alterations.