The leg from below the knee only has to be covered if it’s “minhag Hamakom” (the custom of the place). There may be different ways of understanding minhag hamakom and when it would apply in this case, so this is a question that you definitely need to ask a Rabbi.
If you were asking a clear-cut black-and-white question about hilchos tznius, I could answer it, but that is not the case with this question.
If you were just asking if such communities exist, they definitely do. I think all Yeshivish/Chareidi communities are like that.