This describes a combination of many different individual elements of styles, themes, mediums or inspirations pooled from many sources. It can refer to musical tastes, dress sense, interior design...many things.
She has an ecletic sense of style, today she wears biker boots, pink fishnet stockings, a pencil skirt, a military jacket, a baseball hat, a my little pony t-shirt and a dunlop bag covered in badges from all her favourite bands from ABBA to Kooks