How depressing that anyone thinks 'sacrilege' and 'blasphemy' are meaningful concepts in this day and age. You might as well accuse people of being witches.
Of course there's such a thing as blasphemy in this day and age. I can't imagine any other religion tolerating celebs prancing around in vestments peculiar to THEIR religion. But further than that, it just wouldn't happen. They wouldn't dare, because of the fear of a huge backlash. Why is it seen as only acceptable to mock Catholicism, and no doubt that is what it is, mockery.
If they wanted a religious theme it would be surely more appropriate to have a mixture of garments from many different religions. (why not) I'm amazed that the vatican didn't object to such an irreverent display of mockery.