Britain's Princess Eugenie (blue outfit) and Princess Beatrice (Beige outfit) arrive at Westminster Abbey. Picture: KAI PFAFFENBACH/ REUTERS

There’s a thin line between high fashion and foolishness. The daughters of Prince Andrew and Sarah Ferguson, Princess Eugenie and Princess Beatrice crossed that line when they arrived for the Royal Wedding in little matronly outfits and hideous hats.

Princess Eugenie wore an outfit by Vivienne Westwood. Irish designer Philip Treacy completed her blue and floral print ensemble that resembled a curtain, with a hideous hat.

Her sister, Princess Beatrice, wore a beige Valentino couture ensemble with gloves by Cornelia James and an even more ridiculous Philip Treacy. Her headpiece sat in the front of her head and was more of a small structure than a hat. She looked like she was wearing antlers.