Sheba does not wear a collar, but I use a grey hound
collar when she is being walked.
(she use to wear a nylon buckle release collar.)

Rocky has a leather rolled collar that does not
mat his fur. For walks he uses a choke chain or
choke chain with a gentle leader.

Sheba and Rocky's each have a partially braided leather leash, and they both share a flexi lead for those walks at the park/camping.