For the first time, Prince William joined his brother Harry at the annual Combined Services Memorial service in Hyde Park on Sunday, both decked out in traditional Savile Row style. But where did they get their [bowler] hats?

Spy picked up the trail at Lock & Co, the famous St James's hatters which has supplied the Palace for more than 300 years.

"Actually bowlers are pretty popular right now," says a spokesman."A lot of the fashion press are starting to feature them. For women it's a fashion statement; for men, like the princes on parade, it's a sign of respect."

He adds with a sigh:"Of course, no one's wearing a bowler to work in the City any more."

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Photo: Princes in bowlers

Brim full of English social history