GRE General Test: RC-795513 GRE Reading Comprehension

Two suits of battle armor worn by King Henry VIII were discovered, one from the beginning of his reign in 1510 and the other from 1540. Although both suits of armor were made for Henry VIII, the 1540 suit of armor was 40 pounds heavier than the 1510 suit of armor.
Which of the following, if true, contributes LEAST to an explanation of the discrepancy described above?