I don’t know quite what to call this pattern type, but it’s one of my hands-down favorites. I think it’s circa 1960s-70s, Dutch, German, and/or Scandinavian folk-influenced. I’m just going to call it “folky geometric” even though it usually involves floral and conversational motifs too. If someone can provide a more precise name and era, please let me know in the comments!
Swatch above is a vintage Waverly print from my collection.