I found this dark green/black gingham shirt in my closet and started thinking about which suits it would pair with. I need some second opinions on this combination. The pocket square was honestly just sitting in the jacket, but it can be included in this post for the sake of education.
The suit is navy blue as a reference.
It is not for work or any special occasion, so it doesn't need to work for more conservative settings.
What tie would you substitute for? Why doesn't it work for you?