I'm interested in everything to some degree. Keep in mind that I'm very much a "one of those, and one of those, and one of those over there" costumer, especially when there are bits of surviving garments to be interpreted. Viking-era costuming is fascinating because it combines a relative wealth of archaeological evidence (relative, not absolute) with the need for a vast amount of interpretation and extrapolation, sprinkled on top with issues of modern social trends and fashions in those interpretations. And because it's become one of the "hot fashions" in the SCA (at least in those areas I move in), it's even more imperative to me that I develop my own understanding and interpretations if I dip my toes in that water.

Even if I weren't specifically interested in historic research, I'd find the SCA a deeply fascinating place for studing research methodology and the social dynamics of information transmission.