I'd wear a white halter neck top with black sunglasses. Or a nice yellow-ee cream colored laced tank top. Something like this:
link You can also do a simple tee in colors of purples and pinks. Try a white collar shirt and spice it up with a necklace. I'd also suggest layering 2-3 contrasting colored cami's. If none of the above, try wearing a loose fitted floral top, with a nice belt over your waist.
Try these links for ideas:
link link (this one could definitely work with khaki shorts).
link link link link You can finish up your outfit with a great pair of brown boots or a pair of red or green flats. Anything that you might feel comfortable in. If you want to keep it simple and clean - nice black sunglasses, with a black purse/bag and open wavy hair. If you want to be more dramatic - chunky bracelets and necklaces or earrings.
Goodluck.