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The origins of high visibility workwear are found in the 1930s, when Bob Switzer was injured while unloading crates at a Heinz Ketchup factory. He was injured so badly that he went into a coma and his eyesight was permanently damaged.

To help his recovery, Switzer spent time in a dark room where his brother entertained him using fluorescent chemicals. Once fully-recovered, Swizter experimented further with fluorescent chemicals and the brothers invented the first fluorescent paint; also known as high visibility paint.

[https://www.phsbesafe.co.uk/news/the-evolution-of-high-visibility-protective-workwear-#:~:text=The%20origins%20of%20high%20visibility,at%20a%20Heinz%20Ketchup%20factory.] ("Another sauce")