Disney Silly Symphonies - Three Little Pigs

Before Three Little Pigs, animated characters were usually defined by how they looked. This Silly Symphony departed from the norm by making identical-looking characters unique based on their actions and personalities.

The Practical Pig stands out from his brothers based on his gruff attitude, actions, and voice. You'd be able to pick him out even if all three pigs were wearing the same outfit. But Disney also expanded on each pig's personality by giving them clothing, instruments, and houses that reflected who they were.

The lessons Disney learned about making physically similar characters distinct from each other would later be applied to the dwarves in Snow White.