Why not team a blue gingham long sleeve shirt with tan shorts? As well as super functional, these items look awesome married together. If not sure about the footwear, go with a pair of tan leather boat shoes.
A blue gingham long sleeve shirt and tan shorts are the kind of a no-brainer casual outfit that you so desperately need when you have no extra time to assemble an ensemble. A pair of tan leather boat shoes will pull the whole thing together.