I thought about going with a gold or cream colored silk taffeta, but instead found this wonderful sage green/taupe shot silk. It looks beautiful with the burgundy velvet I have for the coat and breeches mentioned here.
I also found this flower and diamond patterned damask for another waistcoat; very 1780s. Perhaps not for wear with the cool-toned burgundy velvet, as its color is a bit on the warm side, but it would be nice with a dove grey, cream, or even deep gold coat & breeches.
I hope I have time this weekend to at least get started on the coat!

