|Red and white stripe shirt combined with beige pants|
|Red and white stripe shirt combined with light blue jeans and blazer|
|Black and white stripe shirt with khaki pants|
I noticed none of them combined with dark pants and that's what makes the color of the stripe shirt stands out. So why don't you try mixing your own stripe shirt with light colored pants! It's better than trying to mix your stripe shirt with black pants and it's still make you look casual too.