Specifically: 20mm, RAF ONLY (no metal loops)...and the kicker: in a forest green, or burgundy. Or similar colors. Typical Army green isn't remotely close, nor is the usual red or crimson. Russet would also work, but I suspect that's even less likely. And, yes, I have looked through several of the usual suspects we mention here. RAF is much less common vis a vis NATO, and these colors seem to be non-existent in any style.
Also, gold buckle would be preferred, but isn't essential. Buckles can be replaced at pretty nominal cost.
Finally: no perlon. Neither Eulit nor Rios do colors like these. I've tried cheap perlon, and they just get tossed aside.