From “White” to “Y” — A Classic Mishearing

Here’s one of the most entertaining origin stories in wasei-eigo: when the English word “white shirt” arrived in Japan, Japanese ears heard “ワイ” (wai) instead of “white.” Since “ワイ” sounds like the letter “Y,” the word got reinterpreted as “Y-shirt” — and it stuck.

The term dates back to the Meiji and Taisho eras when Western-style clothing was being adopted in Japan. Early Japanese speakers weren’t yet familiar with English consonant clusters like the “t” at the end of “white,” so the word got naturally shortened and reprocessed through Japanese phonology.

It’s Not Just White Anymore

The ironic twist? Despite the word literally originating from “white shirt,” ワイシャツ now refers to dress shirts of any color. Blue ワイシャツ, pink ワイシャツ, striped ワイシャツ — they’re all ワイシャツ. The “white” part of the meaning has been completely lost.

For Japanese salarymen, the ワイシャツ is practically a second skin. Combined with a dark suit and a necktie, it forms the unofficial corporate uniform that fills every Tokyo train car during rush hour. Department stores dedicate entire floors to ワイシャツ, and the “cool biz” campaign (encouraging lighter work attire in summer) specifically targeted the ワイシャツ-and-tie combo.

Fun Fact

If you said “Y-shirt” to an English speaker, they might think you’re talking about a shirt shaped like the letter Y. In English, the proper term is simply “dress shirt” or “button-down shirt.” Meanwhile, Japanese also has カッターシャツ (kattaa shatsu), used more in the Kansai region — reportedly named after the brand “Cutter Shirt” by a Japanese manufacturer.