I don't really separate between Portrait, Beauty, Fashion or Business photography. I also do not care about if people are fully dressed or not at all. Somehow it is all about people anyway. The difference lies far more in the matter, what exactly the subject of the photograph is. A portrait, of course, is most often a mirror of the personality that's being portrayed. Whereas fashion or beauty photography is not about the person itself, but about exquisite robes or the latest in hairstyles or beauty products. Still, human beings are being used to present these fashionable or beautiful subjects.
I am member of SBF (Schweizer Berufsfotografen und Fotodesigner/Association of Swiss Professional Photographers).