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Depending on how 'grotty' you want it to look, there's a few ways to go.

For a clean look, I'd start with a very light gray, give it a black wash, then build up from grays to whites in highlighting.

Since this is an Ork, though, I'd imagine that his loincloth has not been well cared for. Thus, I'd start with something like Deneb Stone or equivalent, give a sepia wash, and build up first to Bleached Bone, then to White, using more white than you would if you were highlighting normally. That should give a good look of "This was white... once", especially if you leave some mottled areas of sepia wash showing.

As an example of the kind of result the latter technique gives: