14 March 1688 – October 1763) was an English textile designer known for creating vivid floral designs for silk fabrics hand-woven in Spitalfields near London in the mid-18th century. Garthwaite was acknowledged as one of the premiere English designers of her day. Many of her original designs in watercolours have survived, and silks based on these designs have been identified in portraiture and in costume collections in England and abroad.
Garthwaite's work is closely associated with the mid-18th century fashion for flowered woven silks in the Roccoco style, with its new emphasis on asymmetrical structures and sinuous C- and S-curves. She adapted the points rentrés technique developed by the French silk designer Jean Revel in the 1730s for representing near-three-dimensional floral patterns through careful shading, and designed large-scale damasks as well as floral brocades. From 1742–43, Garthwaite's work—and English silk design in general—diverged from French styles, favouring clusters of smaller naturalistic flowers in bright colours scattered across a (usually) pale ground. The taste for vividly realistic florals reflects the advances in botanical illustration in Britain at this time, and can be contrasted with French silks of the period which show stylised flowers and more harmonious—if unrealistic—colourations
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