What should I wear to visiting hours?

I'm going to calling/visiting hours for someone who has ped that was very close to me tomorrow and will be there for some time. The job I have is very informal so don't have much to choose from. I have a "air force blue" shirt, a "blue" shirt, and a "pastel green" shirt (got the colors on wiki). Tan khakis or black pants. A royal blue tie, dark green patterned tie, blue and gray patterned tie, and a black tie. I also have a black jacket that matches the pants. What would I wear?