Ralph & Russo, Erdem and Burberry among designers tipped for wedding dress

It is the fashion gig of the decade and rumours are abounding over who has been picked to design Meghan Markle's wedding dress.

Ralph & Russo, Erdem, Oscar de la Renta and Burberry's Christopher Bailey are among those tipped to get the top royal commission.

But the bride may wear two dresses, as the Duchess of Cambridge did - one to the church ceremony and another to the evening reception.

Ms Markle turned to the Australian duo behind British label Ralph & Russo for one of the gowns she wore in her official engagement photos.

Tamara Ralph and Michael Russo are renowned for their full-on Hollywood glamour, jewel-encrusted couture designs.

American label Oscar de la Renta would be a nod by LA-born Ms Markle to her home country.

Oscar de la Renta crafted the wedding dresses of Amal Clooney and actress Kate Bosworth and is known for its classic glamour.

Laura Kim and Fernando Garcia are its creative directors.

Erdem has been a bookmakers' favourite for some time.

Founded in 2005 by Erdem Moralioglu, the brand is known for its sweeping dresses and floral prints.

Canadian-born, with a Turkish father, the London-based designer counts the Duchess of Cambridge, former US first lady Michelle Obama, style doyenne Alexa Chung and actress Keira Knightley among his clients.

Knightley is particularly a fan of the pockets he puts on her gowns, allowing her to feel more relaxed as she tucks her hands away on the red carpet.

"The Erdem woman has remained the same, she has never been concerned with being cool," Moralioglu once said.

Burberry's Christopher Bailey has been cited as the perfect choice by designer Henry Holland.

Bailey, the former chief creative officer, is leaving the British heritage brand at the end of the year.

Holland said: "I would be quite excited if it was Christopher Bailey's final bow for Burberry."

Jenny Packham, known for her intricate romantic, beaded bridal gowns, has also been suggested.

Described by Vogue as "one of the red carpet's go-to designers for dazzling feminine glamour", Packham is already a favourite with the Duchess of Cambridge.

Angelina Jolie, Keira Knightley, Beyonce, Jennifer Lopez and Cameron Diaz are among her fans.

She is the sister of broadcaster and naturalist Chris Packham.

Ms Markle could go down the tried and tested route and opt for the woman who designed the Duchess of Cambridge's lace wedding gown - Sarah Burton for Alexander McQueen

Kate's traditional, high-waisted, full-skirted couture dress with lace applique bodice, which sparked comparisons to Grace Kelly's wedding, was hailed a triumph.

If the American star wanted to pick one of Britain's leading couturiers, she could choose Phillipa Lepley.

Her style is classic, romantic, understated elegance and trademarks are hand-made body sculpting corsetry, beading and embroidery.

Famously discreet, she is a self-confessed perfectionist who believes "a wedding dress should be timeless and flattering above all else".

She designed Geri Horner's wedding dress, as well as those of Ulrika Jonsson and Davina McCall.

At her first wedding in 2011, Ms Markle married film producer Trevor Engelson on a beach in Jamaica in a sleek, strapless, floor-length white dress with diamante waist detail.

She also appeared in a wedding dress in the TV series Suits, with her character, Rachel Zane, wearing the Versailles princess ballgown by Anne Barge with plunging neckline and full chiffon skirt.

Ms Markle's stylist and close friend, Jessica Mulroney, runs the bridal store Kleinfeld Hudson's Bay in Toronto, so it is likely she was Ms Markle's first port of call for help picking out her show-stopping outfit.