Legge is best known for her 1936 Trafalgar Square performance for the opening of London International Surrealist Exhibition, posing in a costume inspired by a Salvador Dalí painting, with her head completely obscured by a flower arrangement.

[1] In March 1915, while his wife was serving as a nurse in France, Legge's father joined the 1st Battalion Seaforth Highlanders.

On 1 January 1919 Legge's mother, who at the time was listed as a YMCA worker, married John Sharpe Sutherland at the British Consulate in Cairo, Egypt.

In 1935, Legge wrote to David Gascoyne expressing her fondness for his book A Short Survey of Surrealism and offering to help organize a Surrealist group in England.

[5] Gascoyne made arrangements to meet Legge, and later described her as "a warm, good-natured, intelligent, frustrated young woman" with an "eagerness for experience" and "a genuinely keen curiosity" about contemporary culture", "especially surrealism.

[5] Once there, Legge stood in front of the Trafalgar lions as Claude Cahun took photographs, as pigeons began to perch on her outstretched arms.

[5] As André Breton gave remarks to officially open the exhibition, Legge wandered through the gallery crowds carrying a prosthetic leg with a silk stocking on it as a prop.

[4] An attractive woman with long blonde hair,[5] Legge has often been relegated to the role of a "surrealist groupie"[9] by various art historians who have identified her as a possible lover of David Gascoyne,[10] Dylan Thomas[11] and René Magritte.

In 2016, a theater group in New York City included Legge as a character in a play based on parts of Rene Magritte's life, entitled, A Journey Through The Mind Of The Surrealist Painter.