What should i do with my Hair and this hat?

ok i have these really cute hats im gonna where tomorrow my hair is like naturally curly but i have a really good flat iron.I'm wearing what of my hats tomorrow and i dunno which one or if i should just my brush my hair with ir or flat iron it with my hat. One of them is navy blue and one is a very light variegated blue. So which color? and should i straighten my hair or just leave it curly? help plz?? and what make up too? black mascara with what eye shadows/eyeliners? plz and thank you!!! oh there really pretty crocheted too. there not those ugly ones there the prettyy ones!