Mr. Xu said that for South Korean b-boys, fashion and function work hand in hand. Beanies make it easier to spin on one’s head. Nineties-style oversize sweatsuits allow for freer movement. Sneakers with thick soles are favored for their durability.

He spotted Kangol hats, Timberland boots, N.B.A. jerseys, Adidas Superstar sneakers and New York Yankees caps while in Seoul. Dancers said artists such as Tupac, Eminem, Biggie Smalls, Ja Rule and the B-boy legend Ken Swift inspired their looks.

Korean B-girls have a presence too, but in much smaller numbers because of rigid social strictures that ask them to work and raise families, all while adhering to unrealistic standards of beauty. (Sound familiar?) “They fall in love with it, but they can’t make a career out of just dancing,” Mr. Xu said.

On the other hand, some Korean B-boys are making a living by dancing full-time or teaching the dance form in studios. Their professional recognition owes something to the dance battles they take part in around the world.