11920Face, Photograph, Beauty, Black-and-white, Portrait, Nose, Hat, Monochrome, Smile, Monochrome photography, Getty Images

Lady Elizabeth Bowes Lyon (later, the Queen Mother) wearing a bucket-shaped hat with a chin strap.

21939Photograph, Retro style, Snapshot, Black-and-white, Fashion, Monochrome, Vintage clothing, Headgear, Hat, Monochrome photography, Getty Images

Marina, Duchess of Kent, at the Epsom Races wearing a tilted hat with dangling pom-poms.

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31944Photograph, Retro style, Vintage clothing, Portrait, Headgear, Lip, Headpiece, Hat, Fashion accessory, Photography, Getty Images

Then-Princess Elizabeth wearing a scallop hat while addressing the Governors Court at the Queen Elizabeth Hospital for Children.

41956White, Photograph, Black, Black-and-white, Monochrome, Monochrome photography, Fashion, Headpiece, Smile, Photography, Getty Images

Princess Margaret in a layered, circular hat during a visit to Kenya.

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51970sPeople, Smile, Headgear, Event, Elder, Tradition, Fashion accessory, Turban, Getty Images

The Queen Mother wears a pastel hat with triangle cutouts to match her chiffon suit.

61973Headpiece, Green, Hair accessory, Fashion accessory, Headgear, Jewellery, Tradition, Tiara, Getty Images

Queen Elizabeth wears a green fabric hat with white flowers by milliner Simone Mirman.

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71973Green, Leaf, Headband, Headgear, Hair accessory, Plant, Headpiece, Street fashion, Cap, Getty Images

Princess Margaret in a structured peacock feather hat at the Royal Ascot

81975Clothing, Hat, Fashion, Headgear, Fashion accessory, Tradition, Sleeve, Visual arts, Model, Pattern, Getty Images

Princess Anne attends a garden party in a floppy green hat with a fabric band to match her dress.

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91977Eyewear, Sunglasses, Arm, Street fashion, Headgear, Hand, Glasses, Crowd, Neck, Fashion accessory, Getty Images

The Queen wearing a blue turban-style hat in New Zealand.

101980Green, Uniform, Military uniform, Smile, Headgear, Hat, Military, Fashion accessory, Soldier, Holiday, Getty Images

Queen Elizabeth at a horse show in a green-and-white floral hat to match her dress.

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111981Hair, Fashion, Hairstyle, Street fashion, Ear, Chin, Hat, Headgear, Human, Fashion accessory, Getty Images

Queen Elizabeth wearing a rosy velvet hat with white piping in New Zealand.

121983White, Veil, Bridal veil, Bridal accessory, Headgear, Fashion accessory, Headpiece, Photography, Hat, Hair accessory, Getty Images

Princess Diana in a baby blue cap with net veil and bow while touring Canada.

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131983White, Clothing, Hat, Fashion accessory, Headgear, Sun hat, Headpiece, Hair accessory, Bonnet, Dress, Getty Images

Princess Diana in a traditional Klondike-style outfit on a visit to Canada.

141985Hat, Botany, Sun hat, Smile, Headgear, Plant, Flower, Dress, Fashion accessory, Photography, Getty Images

Princess Diana in a baby pink John Boyd hat during a trip to Sicily.

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151988Green, Hat, Headgear, Outerwear, Fashion accessory, Holiday, Costume, Fedora, Child, Sun hat, Getty Images

Princess Diana matches with Prince William during the Trooping the Colour in a bright green hat with white trim.

161989Blue, Clothing, Hat, Smile, Headgear, Electric blue, Fashion accessory, Academic dress, Costume hat, Sun hat, Getty Images

Princess Diana in a Phillip Somerville blue turban hat with white brim while in Dubai.

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171991Hair, Wig, Hairstyle, Red, Pink, Costume, Magenta, Headgear, Fashion accessory, Hair coloring, Getty Images

Princess Margaret in an extravagant feathered headpiece.

181993Hat, Clothing, Fashion accessory, Headgear, Fedora, Sun hat, Jewellery, Smile, Costume accessory, Costume hat, Getty Images

Princess Diana wears a periwinkle-and-white hat with an exaggerated brim to attend a wedding.

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191998Hat, Clothing, Sun hat, Fashion accessory, Fedora, Headgear, Fashion, Costume hat, Hatmaking, Costume accessory, Getty Images

Queen Elizabeth wears a blue linen hat with curled ribbon embellishments while on a trip to Malaysia.

202005Hat, Headgear, Fedora, Plant, Smile, Fashion accessory, Flower, Costume, Getty Images

Queen Elizabeth attends a memorial service in a black linen hat with black-and-white pointed ribbon details.

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