You can't go wrong with denim in among the sunflowers. whites, creams, navy and baby blues are all great choices.
corals & pinks
Corals & pinks, burnt orange, browns/camel and rust also look amazing.
Avoid bright red, bright greens, wear mustard and olive with accessories such as a vest, scarf, sweater, jean jacket to keep from blending in with the sunflower colours.
Light and airy earthy tones (pinks, creams, light yellows, peach, taupes) along with deeper earthy tones (plum, burgundy, earthy blues, oranges) will make your colour choices a success.