The photo has a mark on the right botom, a name of i think a dutch photgrapher and the word Djokja. And a fas as i know the Sarong he wears have a Yogjakarta Kreaton Royal Batik print. Some batik print like this are only allowd for Royal Members, like Sultan and Pangeran. The same sort of print only for kreaton membersof Yogja is Prang Rusak see
http://www.flickr.com/photos/yanrf/2509391840/. And the people in Yogja have the knot of their head wrap at the back, not like solo were it is worn at front( like the hulu solo, the sort of "nose" as some people call it).The jacket is Yogja too, same board colars as the photo writen under here. Never the less does he wear a Solo Keris Ladrang with Solo Seluut.
I have a old photo Of The Prince of Solo With his wife Raden Ajoe, both in Yogja dress. So there is proof that members of royal family have their picture taken while wearing dress from other kingdoms.
Regards Michel