I don't know what a "milk jug cover" is! Sounds like a doily with lace added. Would love to see a photo of one.
Yes, that's exactly what it is - usually used to cover the small milk pitcher on the tea tray when serving tea to your visitor's or a large pitcher (jug) kept refrigerated, I have also seen the smaller size used to keep bugs out of drinks too!
Not sure if these are suitable but there are quite a few sets at secrets of
https://www.secretsof.com/content...