Donald Duck's Nephews, Huey, Dewey, and Louie

Most likely this is Huey with his embroidered red cap and shirt.

made and printed in Spain

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In early comic books and shorts, the caps of Huey, Dewey, and Louie were colored randomly, depending on the whim of the colorist.

On few occasions until 1945 and most every cartoon short afterward, all three nephews wore identical outfits (most commonly red). It wasn't until the 1980s when it became established that Huey is dressed in red, Dewey in blue, and Louie in green. 

Disney's archivist Dave Smith, in "Disney A to Z," said, "Note that the brightest hue of the three is red (Huey), the color of water, dew, is blue (Dewey), and that leaves Louie, and leaves are green." Another combination that shows up from time to time is Huey in blue, Dewey in red, and Louie in green. In-story, this inconsistency is explained away as a result of the ducklings borrowing each other's clothes.

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Here is a postcard of the three of them in green, blue and red...

Groetjes uit Duckstad!

(Greetings from Duckburg!)

Donald on a bicycle with his nephews Huey, Dewey and Louie.

Postmarked in 2012 from the Netherlands

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Here is another postcard, only now one of them is in yellow! ...

Walt Disney World

You Can Fly!
Tinkerbell guides Huey, Dewey and Louie high above London toward the enchanted isle of Never Never Land.  The young at heart can share in this adventure on Peter Pan's Flight.

unused, from 1979

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Peter Pan's Flight is a suspended dark ride at the Disneyland, Magic Kingdom, Tokyo Disneyland and Disneyland Park (Paris) theme parks. Located in Fantasyland, it is one of the few remaining attractions that was operational on Disneyland's opening day in 1955. The ride's story, music, staging and artwork are based on Walt Disney's Peter Pan, the animated film version of the classic Peter Pan story by J. M. Barrie.