So lately I've been enjoying this book on 19th C military uniforms which is when they transitioned from glorious peacock costumes filled with historical and cultural references to the remorselessly practical uniforms of WWI and beyond.
https://www.amazon.com/dp/0754819019?psc=1&ref=ppx_yo2ov_dt_b_product_details
Fun book, it has some issues but overall it's pretty good.
Obviously modern uniforms are interesting as well for different reasons but they're not going to be nearly as colorful and ornate as ones from the 19th century.
The exception however is dress uniforms, particularly the kind of parade and formal uniforms you only see for state visits, national days and such. I remember attending an Emperor's Birthday party (as one does) at the Japanese Embassy and seeing the military attaches all had tuxedos and katanas. The uniforms of various Indian states at their Republic day parade are also a treat. And of course the changing of the Guard at Buckingham Palace is always worth seeing.
Dress uniforms are like a language, and if you can read it you can tell the history of a unit, culture etc, but I can't seem to find a good resource on them.
Books on the 19th C help, the Queen's Life Guard in the
UK are basically wearing the same uniform, but I can't find anything modern.
Anyone know of one?