There is a modpack for fabric that is called "fabously optimized" it is a fabric version of optifine features spread across several mods, there is to note that even if it is a replacement, there are features that may not work but optifine shouldnt take more than 2 weeks to update once 1.21 is out.

The discord link is for the Misas HD Realistic Overhaul texturepack were my pack still uses content from, for more info just look it up on Planet Minecraft, my pack itself has no official discord.

My Texturepack focuses on stuff used for building, things like gui, mobs, armor, items are provided by Misas Realistic texturepack (link in the description), i update some of this stuff myself but for the most part i have to wait here (but i plan to do some of these things myself as soon as i am done with all the block stuff, i still have ideas for more options and ctm stuff).

And in case of armor and armor trims specifically, i will probably not do them anytime soon since the idea i would want to realize is incredibly tedious and i dont even know if it is possible, since the default way armor trims work is just a big "screw you" for any artist.
I would need to use CIT to uniquely seperate every combination of armor, trim and clolor, for example the end result could be: iron armor + shaper trim + redstone color = crusader armor.
So i basicly would need to design hundreds of custom armors, which i could but it would probably take up months on its own.