I’m ISO half chaps that fit over the wider shoes like Terrains or winter paddock boots. Prefer leather and not suede. Bonus if it’s available in brown and black.
I am still repairing my old Ariat All Terrain Half-Chaps --three zipper replacements and a lot of elastic under the boot and repair. When they finally are unable to be repaired --I may have to change my whole boot-half-chap system. I’ve been through 3 paddock boots in 10 years —the whole All Terrain just worked or me --sad face.
These fit none of your other requirements other than fitting over Terrains well and coming in brown, but these are what I have found works well with Terrains. I wanted brown to match my Terrains, brown that fit me and over the Terrains was next to impossible to find and this is where I landed.
https://www.smartpakequine.com/pt/dublin-easy-care-ii-half-chaps-6138
I ride in these and my Terrains.
https://www.tackroomonline.com/grand-prix-half-chaps-with-smooth-leather-stretch-panel-lcgp.html
They are on the pricy side, but come in black and brown and there are a LOT of size options. They last really well too!
I have ProChaps that fit over my Ariat winter paddock boots - they might work over the Terrains as well and they come in black and brown.
Get the “Fit” model: https://prochaps.com/shop/the-fit-half-chap/