I love the animated sequences in Mary Poppins and Bedknobs and Broomsticks. Wether anthropomorphic or standard animal types, the designs as well as the animation are just beautiful.
Just look at this trio of underwater creatures. How would you fit clothes convincingly on to fish?!
Below a vis/dev sketch of the bed with five humans entering the Blue Lagoon.
You just can't go wrong with Milt Kahl designs animated by John Lounsbery. All of these farm animals are so beautifully brought to life. Combined with a Sherman song, it's animation heaven.
Milt Kahl dominated all final designs in those days, and that's a good thing. As Brad Bird said, without Milt's influence, the late Disney movies would look style-less. Without any particular graphic approach.