LONDON (Reuters) - Racial diversity in fashion has improved in recent years, but the industry must not treat it like a catwalk trend, British model Naomi Campbell told Reuters in an interview. International supermodel and activist Naomi Campbell speaks to Reuters during an interview in London, Britain, June 24, 2019. REUTERS/Hannah McKay One of fashion?s most recognizable faces, Campbell has long spoken of discrimination in the industry where she has worked for 33 years.