[Lis]

I found that they worked with a large range of covers....
generally small covers though, not newborn sized ones, because they are quite wide in the crotch, especially if you include having to tuck the leg "frills" inside the cover.

I'm trying to think that far back... ... I used a big variety and loved the kissaluvs for fit, they were a favourite in our house.

I didn't find that the covers rubbed on the umbilical cord stump at all, from what I can remember.