According to this theory, westernized clothing style became widespread mainly among officers or interpreters who had negotiations with foreigners in person after ports throughout Japan were opened due to the treaty.
それによると、この条約により各地の港が開かれ、役人や通訳などの直接外国人と交渉をする立場の人間を中心として、服装の西洋化が広まっていくことになる。