Hello Hugh and welcome to the forums.
You have a real keris blade there, but I don't think you would see a person of the culture wearing this ensemble in public.
As for 100 years that would be doubtful for the dress although I haven't seen many of this dress style in recent years.
As far as the attribution you have been given on this piece goes; we have a saying here; "buy the keris not the story".
We have a very large archive of keris related posts and there is a lot to be learned from doing a search by keyword there, and don't be shy about asking questions.
