I had found an interesting information about the ruler Radu I of Wallachia (c. 1377 – c. 1383) who had made a large order of full-equip armors to Venetian Republic.
Source : https://en.wikipedia.org/wiki/Radu_I_of_Wallachia
"An Italian chronicle "Cronaca Carrarese" tells about an expedition of the Hungarian king Louis the Great between 5 July - 14 August 1377 with the intention of subduing a one "Radano principe di Bulgaria infedele" (Italian),identified with Radu I.
These tense relations which preceded the fight are confirmed by the registers of the Venetian Republic where,in the same year, a large order of full-equip armors made by the Wallachian voievod appears.
These armors were to be worn by those "armadura da cavali", 10.000 at number (a slightly exaggerated number) who were defeated in battle against the Hungarian king as pointed out by the Italian chronicle."