Totally feel your frustration, it can be a real mission finding casual female outfits that don’t immediately scream nightclub or fantasy cosplay. I’m in the same boat: just looking for something everyday and wearable, especially for scenes set in more grounded, real-world environments.
You’re spot on about the stuff from Peache clean lines, stylish without being over the top, but yeah, the range is a bit limited. For something similar, I’ve had decent luck mixing in pieces from Oskarsson and Tentman, as mentioned above. They tend to balance practicality with good rigging, so poses don’t fall apart too easily.
Also, while most of the content on Daz skews either ultra-glam or ultra-fantasy, I’ve started pulling from a few fashion retailers as style references when setting up outfits. One I came across recently that fits that modern casual vibe is Rooh London definitely not 3D content, but a solid source of inspiration for how skirts, blouses and relaxed fits should look. If you're into kitbashing or even dabble with Marvelous Designer, you might find their styles helpful, visit here if you're curious.
Hopefully more creators catch on that not everything needs to have everything on display straight out the gate. Until then, it's piecing bits together. Best of luck building your outfit sets, if you come across any hidden gems, would love to hear about them!