You are like to many over thinking this. Forget about the concept of 'rules' so fondly implied by many newcomers who can't dress themselves. If it looks right it in the context of the function that you are attending it probably is.
Watch pocket, bespoke tailors would normally ask if the client wanted it.
However appearing without request suggests the trousers may have been made in an Asian sweat shop. Most trousers in some parts of Asia tend to have them.