Since a few of us have pinpointed this as "submissive urination", and the dog is being "triggered" to show submission at the sight of the leash and coat. It might help to concentrate on getting the dog out of this, what might be called, "conditioned" state of mind.
Looking directly at, and approaching your dog "head on", with the addition of the visual "cues" of the coat and leash, sounds like the pattern which could be changed, so you and your dog can have a fresh start.
Even you turning to the side and initiating a more playful, and less direct contact with your dog could help. I think removing the signals that he is associating with a need to show submission, and choosing another approach could really be of great benefit.
Keping your body language loose and calm, a serene expression on your face, and your voice low, could also help a lot.
I'm sure some of the others here can come up with some positive reinforcement techniques and exercises, to help break this cycle and get you back on track.
Looking directly at, and approaching your dog "head on", with the addition of the visual "cues" of the coat and leash, sounds like the pattern which could be changed, so you and your dog can have a fresh start.
Even you turning to the side and initiating a more playful, and less direct contact with your dog could help. I think removing the signals that he is associating with a need to show submission, and choosing another approach could really be of great benefit.
Keping your body language loose and calm, a serene expression on your face, and your voice low, could also help a lot.
I'm sure some of the others here can come up with some positive reinforcement techniques and exercises, to help break this cycle and get you back on track.