I don't trust hats in general and I don't trust girls in hats specifically. I feel like with the presence of a hat a girl is trying to convey something quite certain about herself. If she is trying to convey that she is whacky and unique and most definitely has an intriguing personality - she has failed. If she is trying to convey that she is a pair of overalls and a big sunflower away from being Blossom - she has succeeded.
Though I do love a lady in a head scarf. I'm thinking more Grace Kelly head scarf than Higab. As for berets. Well you better be damn cute.