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An indicator of social status, a protective barrier against the elements or a simple way to add a dash of flamboyance to an outfit, the hat has many functions. So barbershop quartets, numerous royals, mothers-of-the-bride, private detectives and Olly Murs all have a reason to celebrate - as today, according to charity Brain Tumour Research, is national "wear a hat" day.

So, spare a moment as you don or doff your Easter bonnet - and find out how much you know about headgear.