How funny! I actually have a navy & white horizontal striped long sleeve top on today. I'm wearing it with a light gray short sleeve cardigan (so the navy & white striped sleeves poke out) and a brown belt around the outside to cinch the waist and red flats. I also like to wear it under a yellow cardigan and under a kelly/summer green cardigan that I have. My bottoms are just jeans, but I could also pair any of the above up with tan, brown or gray bottoms as well.
I'd probably do purple, another shade of blue, or green - I like the way an analogous color plays off the graphic stripes . Or you could go with a navy or neutral cardigan and throw a bright belt in yellow over the whole shebang!
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To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}