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[superliminal.livejournal.com]

Does anyone know what kind of fabric is used on this top, for the stretchy piece?

http://www.delias.com/item.do?categoryID=649&itemID=44111

The part with the rainbow lines on it?
I've seen it on a lot of those tunic-type tube tops, but wasn't sure if it was a material, or something I would have to sew myself.

Thanks for any help :)