When it comes to matching pants with a navy blue shirt, there are several colors that can work well, depending on the shade and pattern of the navy blue shirt. If the navy blue shirt is not a plain solid color and has patterns or prints, it’s important to consider the dominant colors in the pattern as well.

Here are a few color options to consider:

1. Khaki or beige pants: These neutral colors can pair well with most shades of navy blue and provide a classic and timeless look.
2. Gray pants: Gray can provide a sophisticated and modern look when paired with a navy blue shirt. Light gray or charcoal gray can work well depending on the shade of the navy blue shirt.