I’m curious about this but not really able to find anything. The sources I’m finding online are saying that kilts are predominantly Scottish, they probably were adopted from Scotland by the Irish, they’re representative of Celtic identity (so also Welsh, Bretons, and Cornish), and can be found in other places, but not seeing much about an English kilt? Anytime I’m seeing Brits and kilts, they’re wearing highland kilts.
Apparently the word kilt is a Scots word (not to be confused with Scottish English) meaning to tuck clothes around the body.