I wrote an article with
step by step how-to instructions for making a dog collar 13 years ago. Even though the instructions indicate nylon webbing, it works for polyester just as well. In my experience nylon doesn't have much trouble with UV, but it can become waterlogged and mildewy more than polyester or polypropylene. But if it's allowed to dry, nylon does fine outdoors.
If you prefer a martingale style collar, I have a how-to for that as well:
https://countrybrookdesign.com/how-to/collars/how-to-make-a-martingale-collar
