I've already posted information about what Beckham's will wear at the big event tommorow, as for the rest of the guests here is what Vogue.uk wrote on their official site:
Vogue editor Alexandra Shulman has opted for Christopher Kane, while Anya Hindmarch has chosen a "classic and chic" Emilia Wickstead look.
London-based designer Osman is dressing both Sara Parker Bowles and Child Bereavement Trust charity co-founder Julia Samuel, while Erdem has created a look for former Armani muse Lady Helen Taylor. Roland Mouret's feminine pieces will be worn by Viscountess Serena Linley, teamed with an Anya Hindmarch clutch,Manolo Blahnik shoes and a hat created by Stephen Jones. Camilla, Duchess of Cornwall, will be dressed by Anna Valentine - the designer who created her wedding dress, when she married Prince Charles in 2005.
Italian designers will also be represented at the Abbey on Friday - Prince Harry's former girlfriend, Chelsy Davy, has chosen two custom-made Alberta Ferretti looks. For the ceremony she will wear an aqua green, bias reverse satin dress - teamed with an aqua green faille silk jacket featuring a deep boat neck and knotted detailing. That evening for the party, she will change into a one shoulder, midnight blue, crepe satin gown with cut-out back detailing, as shown in the sketch above.
Gucci is dressing its communications manager Arabella Musgrave and also Prince William's former girlfriend Olivia Hunt, who will wear a dress and belt by the luxury fashion house. Rowan Atkinson's wife, Sunetra, will wear a Fendi outfit - teamed with a Jane Taylor hat.
Holly Branson will watch the ceremony in an Irwin & Jordan lace sleeveless dress, and Georgia Coleridge - author and wife of Nicholas Coleridge, Condé Nast UK managing director - has chosen a fitted cream suit by a label long loved by the royals - Catherine Walker, with a Philip Treacy hat. The milliner is rumoured to be dressing the head of many royal wedding guests, as is fellow milliner Jess CollettUpdate: Armani will also dress Princess Tatiana of Greece and Denmark, and Princess Mathilde of Belgium