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It's a royal replica rush, as fashionistas flock to imitate Kate's classy engagement frock

Replicas of Kate Middleton's designer engagement dress are continuing to cause a serious stir amongst Irish fashionistas.

The brunette beauty's €460 Daniella Issa Helayel dress sold out across the globe within hours of her wearing it during the press call to announce her engagement to Prince William.

Highstreet lookalikes from retail giants including Tesco proved to be a huge hit with royal watchers in the UK and its £16 dress sold out within one hour of going on sale online.

But there's a different knock-off dress that Irish fans just can't get enough of.

Celebrity favourite boutique Chica, in the Westbury Mall in Dublin, has revealed it has a "huge waiting list" for its affordable version of the slinky sapphire-blue frock.

A spokesperson for the boutique told the Herald that their €99 navy blue Pepita dress by label Ingenue sold out within 24 hours of Kate wearing her original on TV.

"It's absolutely identical to Kate's dress but even we were surprised by just how quickly it sold out. I can't get over how many we have ordered. It was completely gone within the day after she wore it.

"We've had the style in for about a year so it's just a happy coincidence that Kate wore something so similar.

"We have it in a range of colours but it's the navy one that is the most popular now.

"There is a waiting list and it's absolutely huge," she added.

And you don't need a tiny figure like Kate's to pull off the classic look. According to experts the figure- hugging, sapphire blue, silk jersey dress will suit women of all different shapes and sizes.

Long sleeves make it perfect for disguising bingo wings, ruching at the waist creates an hour-glass shape, while the V-neck flatters the bust without putting too much flesh on display.

"Women of all ages from 18-80 and every shape are buying the dress.

We've been stocking the brand for about two years and opened up a new Ingenue store about 11 weeks ago because it was doing so well.

"I don't know what our secret is but we just always seem to have an eye for a trend. With this label it was all about offering something a little less bling and a little bit classier."

The dress is due back in Chica and Ingenue later this week but the spokesperson said they believe they will have enough to cope with demand.

"We're hoping it will be back in on Wednesday."

"We should be able to get a dress for everyone who wants it," she added.