Basil and Dawson

Every good detective needs a good disguise, and Basil and Dawson have plenty hanging in their closets. (The Great Mouse Detective)
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The Great Mouse Detective clip art
Pongo, Perdita and puppies

Pongo, Perdita and their puppies cleverly roll around in soot to pass as black labs in front of Cruella DeVil. (101 Dalmatians)
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Puppy personality quiz
Baloo

Baloo wears a skirt of banana skins and coconuts for his questionable female orangutan disguise. (The Jungle Book)
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The Jungle Book quiz
Esmeralda and Djali

Esmeralda and Djali pose together as an old man smoking a pipe on a street corner to avoid the guards. (The Hunchback of Notre-Dame)
Evil Queen

Using a spell, the Evil Queen disguises herself as an old woman to trick Snow White into taking a bite of the poisoned apple. (Snow White and the Seven Dwarfs)
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Snow White quiz
Lefou

Lefou is unrecognizable under his snowman disguise, complete with a carrot nose, while staking out Belle's house. (Beauty and the Beast)
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Beauty and the Beast quiz
Genie

Genie poofs easily into so many different forms it's hard to keep track. (Aladdin)
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Aladdin quiz
Jafar

Jafar wears an intricate disguise to lure Aladdin to the Cave of Wonders. (Aladdin)
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Top 10 Disney Villains
Jumba and Pleakly

Aliens Jumba and Pleakly wear several disguises to blend in among humans. (Lilo and Stitch)
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Lilo and Stitch clip art
Kuzco

Kuzco disguises himself as a (remarkably ugly) woman, so that he might dine at Mudka's Meat Hut, which does not serve llamas. (The Emperor's New Groove)
Mulan

Mulan cuts off her hair and wears her father's uniform, posing as the male soldier Ping in the Chinese army. (Mulan)
Related:
Mulan quiz
Pain and Panic

Pain and Panic transform themselves into snakes, innocent-looking kids and a winged horse, all in an attempt to get the better of Hercules, on the orders of the ruler of the Underworld, Hades. (Hercules)
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Robin Hood and Little John

Robin Hood and Little John use many disguises to sneak around undetected, stealing from the rich to give to the poor: fortune tellers, a beggar, a duke, a stork... (Robin Hood)
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Robin Hood clip art
Ursula

Ursula transforms herself into the Ariel look-alike Vanessa and uses Ariel's voice to fool Prince Eric. (The Little Mermaid)