Who came up with the sideways cross ring first? you or madonna/material girl
I highly doubt the inventor was anybody recent. The sideways cross has a rich symbolic history that dates back to the Bible if not earlier; one of the first re-usages of it was in 1821 when it was adopted on the Norwegian flag; and later, in 1883, when The Emblem of the Order was created utilizing a Maltese cross on its side. (source: Wikipedia.org)
By now, there are pretty much no new ideas in fashion; everything is just recycled, reappropriated, updated, and reused. Neither myself, nor Madonna, nor Forever 21 invented the sideways cross ring – my guess is that it probably was seen in the 20th Century sometime in the 60’s or 70’s (maybe in a Black Sabbath poster LOL), and Forever 21 was one of the more recent recylers of this idea.