Prison uniforms in older movies and TV series

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I found an information from Wikipedia:

"Prison uniforms in the United States often consist of a distinctive orange jumpsuit or scrubs with a white T-shirt underneath set to make escape more difficult, as it is difficult for an escaped inmate to avoid recognition and recapture in such a distinctive attire. Originally a horizontal white and black bee-striped uniform and hat was used. Striped prison uniforms commonly used in the 19th century (the Auburn system) began to be abolished in parts of the United States early in the 20th century because their continued use as a badge of shame was considered undesirable.
I have a question connected with prison uniforms in older movies and TV series. Why we see light-blue uniforms in different TV series, eg. "Walker, Texas Ranger"? I don't remember any orange uniforms in older movies or TV series.

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I'm looking for prison movie:
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If you read the next two paragraphs of that article you'll know.

https://en.wikipedia.org/wiki/Prison...#United_States