DuckDuckGo lead me to Charles Relly Beard's Historical Dictionary of Arms, Armour & Fashion which cites a document from 1513 referring to Henry Percy the Earl of Northumberland who died in 1527. Beard does not know of any other sources which would be why I have not heard these terms.
What do you make of these terms? Blair imagined that the bolster was like a 17th century hip roll worn with baggy hose to help them stand away from the hips https://www.facebook.com/themodernmaker ... 2126933133 But the fashions in 1513 were different. patelett or partlet is not a word I have seen before, but "a collar worn under the collar of plate like John Smythe recommends" seems as good a guess as any.Armyng patletts for my Lorde. First, ij armyng pateletts of white satten, quilted and lyned w/ lynnen cloth, for my Lorde to vere vnder his harnes.
Arming boulstres for my Lorde: First, a trusyng boulster of white fustian for my Lord to were abowt his myddell vnder his harnes for berryng vp of the curresse.
Hossyn for my Lorde: First, iij p'e of white armyng hose with lapes for my Lorde.
"Equippage of the Right Hon. Henry Earl of Northumberland, at the Siege of Turwin, in France, temp. Henry VIII" The Antiquarian Repertory : a miscellaneous assemblage of topography, history, biography, customs, and manners ; intended to illustrate and preserve several valuable remains of old times (1807) vol. 4 pp. 345-373 https://archive.org/details/antiquarianreper04ingros/
This document has other weirdness like a helmet called an armet (I thought armet and close-helmet were 19th century collector's terms for what medieval people called a helmet or elmetto) and two arming doublets of satin "with a French styche" and two other arming doublets of satin "quilted" or "quilted logenwise" (in lozenges?)