http://www.tribenawaar.com/marketplace/Sassy.html have flare out pants that are under $50 :0)
From experience they are extremely hard to make.
But, what you CAN do is recycle clothing. Take a pair of yoga pants and cut a slit in each leg, and add a triangle of fabric to make a huge flare. There are numerous flare pants tutorials of this nature that I have seen, and I haven't seen them all.
I'd make the overskirt separate, then you can wear it over whatever pants you'd like! I have a knockoff pair of those bellydancer flare/skirt pants and I separated them so I can just wear the pants, or wear the skirt with something else!
I didn't find a pattern yet but I found this add. Wow...these babies are expensive huh?
I thought this was a good idea to make a separate skirt and leg flairs. If you put them over existing leggings you could mix and match your skirts and legs to match whatever mood your in! You would get more for your money!
So here I found a pattern for the pants but no skirt. If you have any experience sewing I would just try to make something up without a pattern. Oviously the skirt will have more panels then the legs and the legs would need to be longer than the skirt. I bet you could come up with something awsome! Post pics if you make some!
i have a pattern for an amazing pair of hooperish pants...they are not the skirt ones but you might love them. Iliano wear is the company, they recently stopped producing clothing but they were generous enough to post their patterns online...check the sprout pants out here, if only i could sew i would have made these by now!
looks like that link doesnt take you where i thought it would
http://www.ilaniowear.com/info.html then 3rd paragraphy down click on 'patterns here' god i love these pants! lol