When it comes to choosing color combinations for cotton shorts, it largely depends on personal style and preferences. However, here are some classic and popular color combinations that work well with cotton shorts:

Navy Blue Shorts:
White
Light blue
Red
Yellow
Beige

Khaki Shorts:
White
Navy blue
Light pink
Olive green
Burgundy

Black Shorts:
White
Gray
Neon colors (yellow, pink, green)
Light blue
Coral
Remember, these are just suggestions, and you can always experiment with different colors to find combinations that suit your personal style and make you feel confident and comfortable with cotton shorts.