You can wear black, ice blue, grey, or white jeans or pants with a dark blue jacket. There are other colors, too, like beige, light blue, and olive green. Since your jacket is dark blue, you can create many more combinations with these colors! But sometimes the basic instinct works fine here like you can NOT think to wear pink or any funky color under the Dark jacket in whatever case, until and unless it's a Halloween event, or you are just in your home surroundings where no one can judge you. At least normal, sane people don't do this. "I said what I said"