JLR offer both Red and Camel seatbelts, but the color choice is limited, and the availability is also limited to certain seat combos.

These guys offer seatbelt webbing in approx 30 colo(u)rs and can rebuild existing seatbelts with new webbing that comply with US safety standards (they seem **** about that - they re-sew the factory label into the new belts and add their own as well).

Firesand with Orange belts?
Sapphire with Blue belts?
BRG with Green belts?
Blackberry with Purple belts?
Yellow belts because you can...
and so on...(you can get a full set of swatches for $10)



They do sell the webbing by the foot, but this is obviously not a DIY project - they need to be sewn properly for safety, so they need the original belts with all the attachments, which of course requires removing them from the car.

Disclaimer - never used them, but looks cool and safe

https://www.seatbeltplanet.com/

 

I like that in my safety equipment manufacturers.