(this has tutorials for elizabethan petticoats, and other clothing, but i'm not sure if that elizabethan ones are the right style for an egl costume)http://gothfashion.info/
(this site may have it's own tutorial, but they also have forums with a diy section so it may be worth looking there for a tutorial)http://www.farthingales.on.ca/costume.html
(again this has period costume patterns but i'm not sure of the difference in styles)
and these are what i got when i searched:-http://demode.tweedlebop.com/crinoline.html
i don't know if any of these will be of help, hope you find what you're looking for regardless - i've been meaning to try making a crinoline myself but never find the time.
i'd love to see your costume when you're done, i love egl style clothing (^_^)
Thank you, I'm probably gonna make a net skirt from the http://gothfashion.info/
site and see if that'll work.