A man or a fish?

Agnes's look is purposefully antiquated and lower-class, which is a clever touch that both makes her more accessible to a modern audience (which tends to prefer Vague Medieval Bullshit over actual early modern clothes. Tudor-era productions really do often suffer from this especially with the women) and also communicates how Unusual she is

despite this she still has a lot of little historical details that make it clear this was a purposeful choice - the contrast between her bodice and her skirt, the way she wears her hair half-up or in a braid like a child to symbolize never growing up, the layers she still has despite the pseudo-bliaut look. also the historically accurate lacing on her stays that shifts as she becomes more visibly pregnant.

I love how every other woman is in period-accurate clothing including the caps and the color scheme. the play with color here is a lot of fun

similarly every man except Will is dressed accurately, he's sort of a man out of time