Not only will this hat get you tons of compliments, but it will also keep the sun out of your face which is a must! Wear it with any outfit for the perfect finishing touch.Women's traveller hat from Mulhbauer. To determine your hat size, measure the circumference of your head. You need a tape measure and mirror. Place the tape measure at the back of your head and bring it together below your hairline at the front of your head, passing it just above your ears, so you can take the measurement in the centre of your forehead. Don't pull the tape measure too tight and now read your head size. For all headwear you wish to pull over your ears, e.g. beanies, hats, caps and so on, add another 1 cm to your head's circumference.