When styling orange pants, pair it with white or black to make the pants stand out.
Don’t over power orange with pinks, purples and blues. (it will be way too bright and look like a unicorn threw up carrots and rainbows)
My favorite art teacher once told me that when coloring your picture, use the same color from the top of the picture as for the bottom so that the eyes can continue to look up and down. So, in styling orange, use little hints of it maybe for the eye shadow, hair, hat, or another accessory to balance the outfit.
A nice complementary color to do with orange is a dark blue or navy and red (but I suggest a small amount like the graphic on my tee)