oh no! I know dealing with all these pieces can be a bit confusing but, hopefully, I can help. If you look at the actual pattern piece, does it say for example “cut 2 of fabric, cut 1 of interfacing”? Normally, interfacing is reserved for facing pieces and you wouldn’t find it cover a full bodice piece…but I guess it could be possible. Also, your pattern layout will tell you which pieces need to be cut out of interfacing fabric. If you want to post a pic of your pattern layout to this thread, I’ll take a look at it for you and will help try to clear this up.