im currently doing a series of equestrian clothing meshes that i would share if they are done. just stuff i couldnt find anywhere to download and am desperate enough to have to try and model them myself in blender lol.
i have no experience with all the programs nor the process needed to bring the files into game. i can only provide meshes that fit the base sim models released for pose creation, as i have a bit of a blender passion.

if someone is interested, i dont care for any of (my) copyrights, as long as you get them game-ready and share them, im happy

Posted an update just so you know what we are talking about. theres still no real texture on them just the blender material. honestly i like them.

Looking at your pics, the meshes appear to be very high poly. If you want morphs, there is a very hard limit to poly count for garments.

If you have the passion to learn Blender, you can certainly learn how to turn them into CC! Making CAS items especially is the most accessible it has ever been, you are in the era of some of the best tools and plugins for the job

As indeed, there is a fair bit you'd still have to do still in Blender for these to be game-appropriate.
These meshes are very cool - but they'll have to be retopo-ed or decimated to a suitable polycount, have LODs made, be textured in all four texture maps, and optionally weight painted for complex pieces - all before they're ready for packaging into a CAS Part.

Especially when it comes to working for free, there may not be many around with the time to do all of that - if you're the one with the passion and desire for these specific items, you may have to be the one that sees it through to the end. There used to be a massive equestrian side of the community, with their own sites and forums, but I do not know if any of them are still online.
Here, there are mostly users who could support you with learning to make these and a good few CAS experts around for solving just about any problems along the way - give a man a fish vs teach a man to fish, yes? :P