“I did it in a loincloth,” declares Donny Osmond as a rock and roll Pharaoh while observing Adam Filipe’s more modestly attired Joseph kicking off this latest tour of Tim Rice and Andrew Lloyd Webber’s now fifty-two year old musical. Osmond is clad in a gold coloured kilt as he makes this nod to his own tenure in the show’s title role during an American revival that ran for six years.