Ham House, Surrey. The Great Hall, with its original black and white marble floor. The ceiling was pierced c.1698-1728 to create the present hall and first-floor gallery. © National Trust Images/Bill Batten

Expertise Theme: 'Costume in portraits'

Cally Blackman

Associate lecturer,  School of Fashion & Textile Design, Central Saint Martins College of Arts and Design

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Dr Sarah Moulden

Curator, 19th-Century Collections (and Interim Curator, 20th-Century Collections) at the National Portrait Gallery, London

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