curl it or maybe wen ur hair is wet put it in a messy bun, go to bed, wake up take it out and shake ur hair and do alot of hair flips and hairspray :)
also, the horizontal mental influence will make your curls appear fuller. whereas they would put a "flat" emphasis on your hair if its straight.
definitely go with the curls. I feel that the vertcal lines of the straight hair would clash with the horizontal lines of the shirt.
dress-shirt from forever 21, leggings from ardenes and belt from urban planet
all opinion of course, I may be fashion-blind lol