Planché's research to determine historically accurate costume for the 1823 production of
King John led to his developing an interest in the subject, so much so that when he published his first major work in 1834,
History of British Costume from the Earliest Period to the Close of the 18th Century, Planché described it as "the result of ten years' diligent devotion to its study of every leisure hour left me by my professional engagements". Prior to this Planché had published his costume designs for
King John and the other Shakespeare plays, with "biographical, critical and explanatory notices". He had also travelled twice to the continent, publishing
Lays and Legends of the Rhine on his return in 1826, and
Descent of the Danube in 1827.
Planché's scholarship was recognised by his appointment in 1829 as a Fellow of the Society of Antiquaries of London. He was a regular attender at the Society's meetings and contributed to the Society's journal,
Archaeologia, but became dissatisfied with the Society's management, complaining of "the lethargy into which the Society of Antiquaries had fallen, the dreariness of its meetings, the want of interest in its communications and the reluctance of its council to listen to any suggestions for its improvement". In 1843—4 Planché was involved in the foundation of the British Archaeological Association, of which he was later Vice-President, and for more than twenty years the Secretary. Planché resigned his membership of the Society of Antiquaries in 1852, in which year he also moved to Kent to live with his younger daughter.
Besides his
History of British Costume Planché contributed to a number of other works on costume. He wrote an article on "The History of Stage Costume" in
The Book of Table Talk, edited by Charles MacFarlane, in 1836. He also provided the chapters on costume and furniture for
The Pictorial History of England by MacFarlane and George Craik, as well as an introduction on costume for most of the plays in
The Pictorial Edition of the Works of Shakespeare by Charles Knight. In 1842—3 Planché edited
Regal and Ecclesiastical Antiquities of England and
A Complete View of the Dresses and Habits of the People of England by Joseph Strutt. In 1848 he contributed "Remarks on some of his sketches for Masques and dramas" to Peter Cunningham's
Inigo Jones: A Life of the Architect. In 1879 Planché completed his most ambitious work on costume history,
A Cyclopedia of Costume, or, Dictionary of Dress, two volumes totalling almost 1000 pages.
Planché's expertise in historical dress was not only of interest to his fellow antiquarians. During her reign Queen Victoria held a number of
bals costumés at which the attendees had to wear costume of a specified era. Planché's advice was much in demand in the periods leading up to these balls.
His antiquarian interests also included armour. In 1834 he published
A Catalogue of the Collection of Ancient Arms and Armour, the property of Bernard Brocas, with a prefatory notice. In 1857 he was invited to arrange the collection of armour formerly belonging to his friend Sir Samuel Meyrick for the Art Treasures Exhibition in Manchester, a task which he repeated in South Kensington in 1868. Planché was also concerned by the state of the armour in the armoury of the Tower of London, and wrote a number of reports on the subject between 1855 and 1869. In that year the War Office invited him to rearrange the collection in chronological order, which was one of the things for which he had been campaigning.
Among his works on other topics were two with royal connections...
Regal Records, or a Chronicle of the Coronation of the Queens Regnant of England, prompted by the coronation of Queen Victoria in 1837, and
The Conqueror and his Companions, written in 1874. Planché's personal life also inspired a couple of publications. In 1864 he published
A Corner of Kent, or some account of the parish of Ash-next-Sandwich, the result of three years work on what was originally intended as a short guidebook to antiquities within the parish of his son-in-law, the Rev. Henry Mackarness. In 1872 he published his autobiography, a two-volume work entitled
The recollections and reflections of J.R. Planché (Somerset herald): a professional biography, containing many anecdotes of his life in theatre.
In addition to the works already mentioned, Planché produced over 100 papers and articles on a wide range of topics. His obituary in the
Journal of the British Archaeological Association mentions in passing the following:
Naval uniforms of Great Britain, early armorial bearings, processional weapons, horn-shaped headdresses of the thirteenth, fourteenth and fifteenth centuries, the clarion, the Stanley crest, ancient and medieval tapestries, armorials of Ferres and Peverel, the Cokayne monuments at Ashbourne, the tilting and other helmets, the family of Giffard, the Earls of Strigul (the Lords of Chepstow), relics of Charles I, the Earls and Dukes of Somerset, the statuary of the west front of Wells Cathedral, various effigies, brasses and portraits, the first Earl of Norfolk, the family of Fettiplace[1], monuments in Shrewsbury Abbey, the Neville monuments, the Earls of Sussex, of Gloucester and of Hereford, and the Fairford windows.