A concept I had in mind for the Yuyan archers in the Legend of Korra era with more modern uniforms and weapons.
( check at Vachir for comparison)
The idea of a short jacket with a darker thick border and a red piece on the left side of the neck, the color is less bright and it's asymetrical with shorter leaves ( instead of tugging longer ones in the arm protections).
The blouse is now a thin turtleneck top, following every movement.
Exit the "skirt" parts of the bottom, which is the same pants but with pockets - who doesn't need pockets?-
A tactical tight pouch when pockets aren't enough.
The arm protections are now on both arms.
Belt with the usual "triangle" symbol.
You also have it on the head piece but not the knot and the tissue anymore, it wasn't practical.
The boots are now hight instead of short ones with bandages. It also have the separated thumb toe form that we can see in the RC police uniform. The Yuyan were shown to be kinda "acrobatic" so I figured it'd help them to be more stable, comfortable and agile.
Big ass mechanical bow, more powerful than the classic one and with features to help targetting.
The arrows are basically the same I guess?
The quiver can be wear on the back and on the side of the leg ( hold by the belt) depending on the current needs.
EDIT: winter version added for special occasions.
EDIT 2: FInally added the tatoo. However I wonder if it's still a tatoo in LOK era and not a make up item, like a temporary one. Also if it's a real tatoo I hc them having to shave their eyebrow the first time they receive it.
Also for those who want a mount, rhinos are only for parades, we have motos now. Like the ones of Bongo and his barbarians.
To sum up, they were the secret weapon of the Fire Nation back in Ozai's times, bow I see more them like an elite troop, acting as bodyguards for important members of the political sphere and for special operations. They use their historical uniforms and mounts for shows and parades, being a well known attraction for tourists ( a bit like the Queen's (lol calling them the King's guards is hard) guards for example, but remaining trained soldiers.