what exactly do you mean by fashion lawyer...?
there are various ways you could work in the industry as a lawyer, esp with a big group like LVMH because of the complexity of their corporate structure and the diversity in their transactions... but maybe more specifically what you're referring to is intellectual property? as opposed to say... those who handle mergers and acquisitions. those dealling with intellectual property would be the ones who protect the designs, logos, etc. for example, at louis vuitton, their intellectual property lawyers would be the ones dealing with the counterfeits and the case against dooney & brooke... and at chanel, with the CHANEL logo