... except for the fact she has hired Gianni Versace, Donatella Versace, Jean Paul Gaultier, Paul McQueen, Alexander McQueen and many more in her career which disproves that assertion thoroughly. She even raps about all the goddamn people she has working for her on American Life.
Well of course, she doesn't design the clothes herself because she's a singer and songwriter not a fashion designer. But she decides herself which of their clothes to wear and for her tours she directs them on what type of costumes she wants and they do the actual sewing and technical part of designing. There's no one in the music business who does everything themselves because you can't be good at every task. But she is in charge and is the leader sort of like a movie director. A movie has a costume designer but the director decides what they want the costume designer to design.