DETERMINE YOUR FACE SHAPE:
Diamond: like oval, you can wear a lot of different styles. Just avoid too small brims or high crowns that will accentuate your cheekbones and chin.
Oval: Longer than wide: you can wear about anything but avoid the too wide crown.
Square: softer designs, avoid structured styles.
Round: structured hats, wide brims, angular and asymmetric style.
Triangular: high crown and small brim (short, straight, or upturned). Don't hesitate to add accessories for an asymmetrical effect.