I think I may have found the source of the #MarvelUniverse. 19th century paintings of ancient Britain costumes.

#CharlesHamiltonSmith (1776 - 1859)
#HistoDons
#MarvelComics
#CaptainAmerica
#Loci

https://www.royalacademy.org.uk/art-artists/work-of-art/military-costume-of-the-gothic-nations-on-the-western-coasts-of-the-baltic