|I came about this by accident when I made New Look 6204.
I needed to finish the armhole, neckline and hem on a thin, uncooperative knit. I tried a narrow rolled edge, but it rippled and then stayed straight in some areas. I folded it under 1/2" and did another rolled edge on the fold, almost like a tuck. It drew it up enough to fold over the original outside edge inside, almost like a facing. Some areas did still curl, but since it was the right side showing, it looked nice and like I had planned it -- no worries about the "facing" showing.
It gave it a fun mock layered look.
I may triy this again in a solid fabric or even using contrasting thread.