I noticed the other day whilst browsing that the Perry's have plenty of useful uniform and flag info for the WotTA on their website. Simply click on the image or range to see the uniforms and flags.
https://www.perry-miniatures.com/product-category/metal-ranges/war-of-the-triple-alliance/ (https://www.perry-miniatures.com/product-category/metal-ranges/war-of-the-triple-alliance/)
Thanks for that Steve....