Aragorn currently doesn't wear a collar, as I keep his harness on him 24/7. His leash is also 6 ft long, although I have a 15' training lead left from Arwen's puppy days. It is purple and I use it when the yard is too wet for the chair. I can stay on the path, and it gives him some length to do his business. When he is older and at an older age and size, he will get a rolled leather collar. Chewy has a blue one I like, that will go with his leash. He also will get a martingale. I can't decide if I want to stay with the aqua color his harness is, or get one that matches his leash.
Leashes, collars and harnesses are such a big decision. I tend to have a color scheme for each dog. Arwen's was purple, because Misty's was pink. Then I saw this butterfly leash and loved it, so she is now a purple/pink color scheme. Aragorn's scheme is the light, bright blue.
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