Neutral colour that makes less sense with the colour colours. The jacket feels too yellow for the shirt and tie. Doesn't really clash but feels a little off, like the whole look can't come together and get off the ground. Neutrals anchor the other colour. The colour of the bark or stem matters to the effect of the tree or flower. Changing them would feel oddly weird.
Grey, white and navy are the perfect nautical groom attire: http://www.stylemepretty.com/little-black-book-blog/2014/11/18/nautical-ocean-house-wedding/ | Photography: Carla Ten Eyck - http://carlateneyck.com/