Oh I love Elizabeth’s costuming on Poldark!! Some of the best imo. (I kind of…mainly just watched Poldark for Heida Reed & Elizabeth if I’m bein’ honest shshsh but her costuming certainly didn’t hurt!!)
They were pretty hit or miss for sure on TWP…budgeting, maybe?
And yes, a lot of them were very bad. I remember the one we see Jane Seymour wear in her first scene is like…a pencil-thin headband quite literally, just why:

What is this?? Degrassi?? One Tree fuckin’ Hill?? I hate.