Olivia Newton-John and John Travolta on the set of Grease just after "Bad" Sandy's complete makeover - 1978 Olivia Newton-John and John Travolta on the set of Grease just after "Bad" Sandy's complete makeover - 1978

Or does your style fall somewhere between the two extremes?

The film version of Grease starring John Travolta and Olivia Newton-John came out 40 years ago this June 16. In fashion circles, it goes down in history not just for its buoyant, fun-loving take on ’50s style, but also for one of the greatest on-screen makeovers of all time.

Olivia’s transformation from poodle skirted, ponytailed “Good Sandy” to black leather swathed, cigarette smoking “Bad Sandy” is nothing short of breathtaking. The startling moment speaks to the bad girl in us all and offers plenty of style inspiration on how to unleash you inner rebel — specifically, with the help of an off-shoulder top and some skin-tight leather.

And let’s not forget there’s a lot to be said for Good Sandy’s style, too. Peppy tulle skirts and soft hues are totally in right now, especially on the red carpets. Millie Bobby Brown is a particular master of the lighthearted aesthetic.

So are you more of the not-a-hair-out-of-place, pastels-wearing type? Or is solid black with a dash of fiery red your forte? For many street style pros right now, the answer is an interesting blend of both — a leather jacket worn over a patterned dress, or a pair of tight leather pants cast in hot pink.

If you’re tempted to say “Goodbye to Sandra Dee” with your own wardrobe, look to these experts (and of course the original movie) for Grease-caliber cues. — jas