Try Stillwater kilts for this. They have the material and colors, solid bottle green and solid saffron, and they make sashes for the ladies. Find a RenFest cloak pattern at Folkwear and offer to be their guinea pig. Since they sell saffron and solid green kilts this would be win-win for them. And you shouldn't have any trouble finding a Tara brooch, but don't get it confused with a Scottish pennanular. Once you find out the per-meter cost of the material, though, you may change your mind.
"Bona Na Croin: Neither Crown Nor Collar."
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