Primary Sources are first-hand accounts of a topic, from people who had a direct connection with it. In fashion history research, these can be magazine articles, photographs, drawings, adverts, film footage and original items of clothing or accessories that were created in the period you are studying.
These can give you clear ideas about how clothes were worn in particular years, help you recognise key historical styles, what was popular in the period, and how real people engaged with clothing throughout history.