Various, Notes and Queries, Number 70, March 1…
“ A cardinal's hat is differenced by colour and the number of its tassels, not by its shape, which is the same for all clergymen. Thus, for simple priests, a black hat, with one tassel on either side; for a bishop, a green hat with three tassels; for a cardinal, a crimson hat with five or seven tassels. What the reason may be for the variation in the number of the tassels amongst cardinals, I should be glad to learn. ”
