Sunday Best is a weekly feature spotlighting style in film, on TV and on the runway. This week: A look at one of Marianne Agertoft’s designs for the PBS TV series “Poldark.”

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“Poldark” comes to its sure-to-be-swoony conclusion Sunday night on PBS, and I didn’t want to let that pass without a nod to this series’ beautifully simple 18th-century costumes, designed by Marianne Agertoft. (I would also like to know how it is that Demelza’s hair gets gloriously bouncier and more contemporary-looking with every episode — the sea air in Cornwall, apparently, has a volumizing effect — but that’s a question for another day.) Here’s Eleanor Tomlinson as Demelza in her new gown for the ball in Episode 6; though the dress’ silhouette is very much of the period, it was inspired (as you’ll learn from the show’s delightful Pinterest board, pinterest.com/masterpiecepbs/poldark-costume-inspiration) by the mid-20th-century designs of Charles James and Christian Dior. And looks, not incidentally, lovely by candlelight.