Thinking about it, certainly almost every character don't buy their clothes from some department store. They're tailor-made. Unlikely that all of them know how to sew, so there must be people offering the services. Who are the tailors of Gensо̄kyо̄? Perhaps one of the sages is also a tailor?
For this instance, even if you have the same body type as Remilia, her clothes would certainly not quite fit you as good as it would the owner, since they were made just for Remilia's measurements.
