I think it is fairly easy to get fabric of other eras for use in vintage quilts through the internet. I know there is a shop that deals in vintage fabric in Leadville, Colorado. There must be others in lots of places. I would also think that you could find what you need with reproduction fabric. Part of situation involves how the quilts will be used. Will they be used hard and washed alot or will they be hardly used because they are regarded as keepsakes that span the generations. Either situation is worthy of all the work you put into them. They will be loved.