Okay, I've put up more Twi'leks stuff. I'm going to try to make a full-head Bib mask out of slush latex. Waiting to save up enough to order a good amount of the stuff.
Twi'lek have 2 lekku (tail-looking things) extending from the back of the head. These are fairly long, and when straightened will reach the waist.
Twi'lek have...sorta horn-looking growths on the temples.
These outfits are one piece and appear to be knitted. I know nothing about knitting, and can't help you out here. But you could make them out of any fabric that looks close enough. Am working on the pattern.
Oola -- Jabba's Twi'lek dancing slave that got thrown to the Rancor.