are the chukkas green or just gray? I don't think the colors are that off--maybe a white t would pull it together more than the gray, and the shoe color does throw the balance off a little.
but I've been wearing a lot of tan and black together lately so I've got no problem there.
edit: talking about @foxhound
They are a really duck olive suede. I think it's a good fit but as I said, I don't really know what I'm doing.