In keeping with the occasion, the Countess also sported a white corsage, complete with pearl beads, on her right wrist.
Upon her arrival at Guildford's impressive cathedral, Sophie was presented with a bright bouquet by a particularly excited young girl, before admiring the multitude of floral displays.
Earlier her day of engagements Sophie visited nearby Farnham for a meeting with Disability Challengers and toured the Educational Museum in Haslemere to celebrate its 125th anniversary.
Sophie also chose a white outfit for her appearance at the Queen's coronation service on Tuesday. The mother-of-two wore a lace dress and strappy sandals for the special occasion and teamed the frock with a large white hat.
Sophie and Prince Edward's daughter, Lady Louise, also wore white for the service at Westminster Abbey, stepping out in a white tights and sporting a white cardigan over her peach-coloured dress.
The Countess of Wessex's appearance in Surrey comes just days before she and Prince Edward fly to Stockholm for Princess Madeleine's wedding.
The royal couple, who often represent the UK at European royal weddings, will travel to the Swedish capital to witness Madeleine tie the knot with her fiancé Chris O'Neill on Saturday.