E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Ladies Plate (The),
in races, is not a race for a prize subscribed for by ladies, but a race run for by women.
On the Monday succeeding St. Wilfreds Sunday, there were for many years at Ropers Common [a race] called the Ladys Plate, of £15 value, for horses, etc., ridden by women.Sporting Magazine, vol. xx., New Series, p. 287.