That light blue number you've seen does look great with khaki suits- you should give that a try. Â I've done that, and I've also worn khaki suits with a very light lavender/purple combo (solid, light lavender shirt and darker lavender/purple tie). Â Kinda funky, works surprisingly well. But the best combo for khaki suits, I think, is a white shirt and solid black tie. Â Simple, clean, elegant. Â Looks great. Â You'll see Sean Connery wearing that as James Bond in at least one (and I think more) of his movies, for a summer look that's still classic and refined. Â Hey, if it's good enough for Bond, it's good enough for any of us.