I think I may try the 'disappearing dart' method. That's what I'd first thought of and also my rack goes right from one side to the other as I'm very narrow across the back and I'm not sure I would be confident in the placement of the CF adjustment. I might end up with something like a sporran hanging down the front!
Loads of info there
@DementedFairy thanks and I've saved it to go back over. I'm eyeing up those fish eye darts...
I might just try a toile
@Ploshkin. I'd like to be able to hack and chop to see what happens when I make all the different adjustments.
I've put the skirt together, with a couple of birds' nests here and there, but I've sorted out my tension and settings and the fabric is behaving beautifully.