Why did Korean clothes reveal their breasts in the past? Is this true?

It is true that at the beginning of the 20th century, American missionaries used the most advanced photo bleaching technology at the time to take photos of North Korean civilian life. At that time, Korean folk spread a kind of short clothes for women to wear in summer, which was beautiful because of the exposure of breasts.

However, this very normal national custom was regarded by the Japanese imperialists as "immoral" and "rebellious" and "lost the face of the Japanese Empire". Therefore, the Japanese authorities began to adopt cruel measures to restrict the popularity of this national costume.

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Once a North Korean woman wearing such short clothes is found on the street, she will be fined at least, and not only fined, but also slapped in public.