I've always thought black looks nice on all horses, seeing as how it's a neutral.
For chestnuts, I absolutely love turquoise which you've already tried on him. I just ordered my chestnut OTTB mare a black halfpad, and a black saddle pad w/ white trimming. She also has turquoise SMBs on order but we're waiting for them to come in.
So maybe a black paired with some shade of blue or green? Even purple if he's a little flamboyant.
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