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A close look at Khal Drogo‘s attire (and pecs, for those who are interested in such things!) in this shot. The very broad leather belt is pretty cool. I am reliably informed that the dagger hilts we see here are part of a matching set of daggers that Drogo and his bloodriders have, and that the black hilts were supposed to be dragonbone.
However, given the fact that the dragon skull is not black, it may be that these are now to be considered some other sort of black material (ebony, for example), or perhaps it’s supposed to be specially-treated.