The Netflix hit’s season 4 wardrobe is to Di for.

She just kind of looked ordinary.

You know, bobbly old cardigans and jumpers and skirts a bit dumpy, really.

The Crown Season 4

Des Willie/Netflix; Tim Graham Photo Library via Getty Images

(Corrin agrees: I was like, are you joking?)

Her look evolves a bit when she moves to the palace, but it still wasnt quite her.

It was a little bit old-fashioned and safe, Roberts observes.

The Crown

Netflix (2); Des Willie/Netflix

Wryly titled Fairytale, the episode invokes the popular conception of Diana as a sort of doomed Cinderella.

Ben Caron, our director, had always imagined it like a Cinderella story.

And then it sort of culminates in the wedding dress.

The Crown Season 4

Alex Bailey/Netflix; Jayne Fincher/Princess Diana Archive/Getty Images

Its almost like a big Walt Disney fantasy, that dress.

Its not an absolutely spot-on copy of it, Roberts clarifies.

Its closing your eyes and thinking, What was that dress like?

The Crown Season 4

Des Willie/Netflix

And it was big sleeves, wasnt it, big puffed sleeves and that big skirt.

While some costumes onThe Crown like uniforms and ceremonial pieces demand accuracy, theres a mixture, Roberts says.

Im a big believer in making a big nod at it.

The Crown Season 4

Netflix (2)

It was like designing a dress-up dolly look for each occasion.

I always felt very much at the beginning thats what we were doing, for her.

You feel shes growing up a bit, Roberts says.

The Crown Season 4

Des Willie/Netflix; Ollie Upton/Netflix

Her unlikely fashion foil is all grown up, however, and dressing with intention from day one.

I found that absolutely extraordinary how her journey, and her clothes, developed, Roberts says.

As her strength grew, so did her shoulders.

In a way, it was like putting on her armor.

Her final appearance is her fiercest of the season.

The first time you see Diana [is] as that little elfin fairy creature.

That, to me, sort of sums Diana up in season 4.

Season 4 ofThe Crownis now streaming on Netflix.