Actually she wants to put her smell on your clothes instead of smelling your smell.
From cat behavioral consultant Marilyn Kreiger:
” * Marking you—or another pet—as “Mine!” When cats head-bunt or rub cheeks on humans, it is often to mark you as their own. They will also mark a fellow feline this way. “Pheromone is a scent chemical, but it also helps cats with bonding behavior,” Johnson-Bennett says. “If two cats know each other and are friendly, they will engage in scent exchange. It helps the colony to have one familiar scent.”