A navy blazer and light khaki pants create a classic and versatile look that can be dressed up or down depending on the occasion. When it comes to choosing the color of the shirt, tie, and shoes to pair with this outfit, there are several options to consider based on your personal style, the event, and the overall color scheme you want to achieve.

Here are a few suggestions:

1. Shirt: A light blue or white dress shirt is a safe and timeless choice that goes well with navy and khaki. If you want to add some color to your outfit, you can also opt for a pastel shade like pink, lavender, or mint green.
2. Tie: A patterned tie in shades of blue, red, or green can add some interest to your outfit without being too bold. A solid tie in a complementary color like burgundy, mustard, or navy can also work well.
3. Shoes: A brown leather dress shoe is a classic choice that complements both navy and khaki. If you want to dress down your outfit, you can opt for a pair of loafers or suede chukka boots. Black shoes can also work, but they tend to look more formal and may not be the best choice for a casual setting.