Have you heard people saying "Baby" to everyone they know? Have you seen young people using many flat caps? At any time the boys used the longish hair and side? Does this massively saw him? It reminded you an artist? Just listen to the song popularized Justin Bieber "Baby" and are questions and answers will be meaningless.
Some loved him others hated him during his early career, now merged sounds with Latin rhythms and has even gained acceptance of certain public rockers and no fan. Get someone who hated you achieve love, it is certainly an artistic feat. Achieve capture an audience that rejected your music, it's something quite bold and intelligent, from the point of view of Marketing and musical.
There is so much relevance for the song itself but by the mass movement that can start an artist without him, and his fans are aware of everything. That's right, it is sometimes difficult to get that kind of question, Why do people dress in a certain way? Even more difficult if it is a male audience, the music would be for women but for men like that, in the case of male artists so.
There are massive trends that usually arise from the presence of an artist who imposes not only clothes, ways to wear your hair but also a kind of language. As the artist grows, especially if Justin started young, and currently writes lyrics chords to their age, which is very close to the audience's emotions at one point did not identify with their music. He was a child and sang as a child, now is something different and the public knows.