no help with wings cos I haven't looked at it for yrs

but I have tried a similar sort of dress (home made lol ) and got the same sort of thing Shuy was getting! anything like a pose would cause all the layers to merge poke thro' explode gosh if it could go wrong it did, not got back to that yet but did wonder if making each "ruffle" a diff cloth setting would help, inner one quite "stiff" then each layer going out a lighter cloth dont know if it would work, dont even know if one item can be different cloths but if I ever get time to test it I'll post results.

For your item I wondered if you could delete the inner dress (apart from bits u might see) then add a line of polys to attach each ruffle to whatever is left (think suspenders lol ) again I have no idea if it would work like that but should stop the falling down