I recently came across Emily's shops Fur Babies Puppy Boutique and Supply on a Dime on Etsy. Emily offers dog collar kits and instructions on how you can create your own collar, and they're easier to make than you think! I am a newbie sewer and even I was able to create Jack a collar.
If you're not interested in breaking out the sewing machine, you can still get buy a premade or custom collar in your desired pattern here!
My kit came with the hardware, webbing and ribbon needed to create Jack a collar.