[Question] Full-body coverings outside Israel & beyond Lev Tahor?

I’m a relatively secular Jew (grew up Conservative) who lives in a predominantly Orthodox/Hasidic (mostly Chabad) suburb in the Midwestern US. I’ve been surprised to see a few times lately children from frum families who are dressed in full-body black robes not unlike a burqa. Sometimes their face is covered, sometimes not. It seems like it could be just one family. From what I’ve read this practice is pretty controversial and limited mostly to some fringe Haredi groups in Jerusalem and the cult Lev Tahor.

My question is this: are these Haredi groups more geographically widespread than I thought? Is full-body covering known to be practiced outside Haredi enclaves in Jerusalem? Can someone enlighten me about the prevalence of this practice outside Israel?

Thanks!