What, you think Christianity had no influence on pagan Europe’s sexual mores? Ever pick up a history book? Or read the early church fathers views on women and sex?
Perhaps it was. But where's the evidence?? All they have is a surprising new discovery about what people wore. They've completely extrapolated the role that Christianity may or may not have played.
Once upon a time science cared more about facts. Now they care about juicy guesses that fit in with the political agendas. Their colleagues are more apt to slap them on the back for that stuff.