This weekend marks Grease’s 40th anniversary ... Then there’s Sandy’s all-black outfit, versions of which have been repurposed for fancy dress parties for the last 40 years.

John Travolta and Olivia Newton-John are back as Danny and Sandy. Travolta, 65, and Newton-John, 71, reunited and dressed up as the iconic lovebirds during the Meet n’ Grease sing-along event at ...