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Sarah Michelle Gellar: 'Scooby-Doo'

(In Style) -- She may have swapped slaying for sleuthing to play dishy teenage detective Daphne Blake, but Sarah Michelle Gellar hasn't lost her punch.

More likely to tote Scooby snacks than sabers in this ghoulish tale on Spooky Island, Daphne, the perpetual damsel in distress, is out to prove she's a serious-minded and physically capable member of the old mystery-solving gang.

"In the beginning they think she's all style and no substance," says costume designer Leesa Evans. "But Daphne finds her independence, and by the end of the movie she's gotten pretty tough and can really kick some butt."

And with an all-purple wardrobe of stylish spin-offs of her famous frock, Daphne puts her own sassy spin on caper cracking. So rhatch rout rhosts!

Hair

Not even a resort's worth of terrorizing ghosts can ruffle this supersleuth's tresses. For locks as flawless and smooth as Daphne's new tough-girl moves, apply a protective treatment like Kérastase Nutri-Liss before blow-drying hair straight with a large round brush, curling ends slightly inward. For a high-shine finish apply Kérastase Serum Nutri-Instant.

Clothes

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Staying true to the authentic Scooby-Doo style, Daphne's duds are all seventies-inspired designs, "but with a little bit of contemporary flair," says Evans. "To show the passing of time, we gave her different silhouettes." From her palazzo pants and halter combo to her keyhole minidress, bathing suit and fitted jumpsuit, each of her outfits was custom-made from vintage seventies fabrics in Daphne's signature purple and lavender palette.

Accessories

To give Daphne a little extra sass for her big-screen debut, Gellar sports lavender stretch-patent-leather go-go boots in place of her TV persona's typical footwear: tights and flat pumps. "They just felt a lot more fun," says Evans. "And they looked great with her miniskirts." In fact, the stylish sleuth sports the knee-high boots -- which are decorated with ankle buckles -- throughout most of the film. Other classic Daphne-esque accessories include a purple headband and chartreuse scarf.