No one wants to put a harness over a coat....or under it....so we built our velcro wrap dog harness into the coats we make. So just wrap the coat around the dog, attach the leash and go.
Two layers of soft fleece with an inner layer of thick cotton interfacing for warmth and strength. Hook & loop closure at the lower neck and belly. Strong webbing down the back holds a welded "O" ring.
This coat is a great look, is soft and warm, and is safe.