A lot of nice examples going up, but frankly i'm not convinced that we are any closer to answering José's initial question. Certainly a form of dress exists which collectors at least have seen fit to tag as "chieftain" keris. I have seen a couple of posts that begin "i have heard" or some other unsubstantiated claim, but nothing that nails down that a keris of a certain width with 7 luks in one of these fat, wide sheaths is definitely a "chieftain" keris and not simply that of a wealthy merchant or man of means.