In reviewing the comments from this post, Cynthia Gibas helpfully said the following:
I have a lot of clothes in this general wheelhouse. They’re very much not cheap. Brands to look for: Bodil, Grizas, Krista Larson, Alembika, Kaliyana (Canadian and they do not accept returns, so you REALLY have to be confident). A lot of the clothes are made to order/on demand, they are not fully mass produced. They can’t really be gotten in mainstream stores. You mostly find them in what my sister and I call “middle-aged funky lady stores”. Independent boutiques that you find in college towns, vacation hotspots, and bigger cities only. One of my favorites is Kati Koos — she sells Krista Larson and other similar brands from a shop in Modesto CA but she’ll ship all over the place. Some of the other indies that have pretty solid online presence are Hello Boutique, La Petite Boutique in Richmond VA, GAIA in Winston Salem NC. This style is a very very specific niche/rabbit hole and once you start to know the places that sell these brands you’ll find others.
Also, Christine and Kay suggest The Artful Home as a good source.
Thank you all!