I did use the Monaco shell as my front sloper. But you know, it's not necessary, I just had it on hand with all the darts to the correct center-bust spot, it'd have been silly to do it again with the Official Sloper. You do need to get the darts to the middle, if you need any darts at all, the twist already takes up fabric so you don't have any to spare. And with all that stuff already going on, it'd be a shame to add darts elsewhere :-).
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