Because of the links drawn between kogals and enjo kosai (compensated dating), in which women and girls are paid for dates and sometimes sex.
A subculture of conspicuous consumption among young women in urban Japan, typified by dyed hair, artificial suntan, platform boots, miniskirts, and expensive accessories
Kogal tackiness was egalitarian, and contrasted with the cute and conservative styles.
kogal
Etymology
() Japanese コギャル (kogyaru), of disputed origin, apparently influenced by English gal.