Nara/Tang outfit link dump.

OK, there is definitely enough of the bottle green Thai silk for an uwaginu (the robe with the flowy sleeves) and I've got two different Asian "brocades" in red that could work for the haishi (the vest).
http://www.iz2.or.jp/fukushoku/f_disp.php?page_no=25 shows layered skirts, however, the reconstruction in the Nuikata book has a single skirt in tiers - top tier pleated into waistband, second tier pleated into top tier.

I remembered that Jo Anseeuw has a great gallery of Jidai Matsuri photos on pBase. This one is lovely and gives me a clue about what to do with my hair. Not to mention buying a giant scarf from Dharma and playing with dye.

Photo by Jo Anseeuw.

Another great photo off Flickr, by Jon Rocatis. http://www.flickr.com/photos/rocatis/304448644/
by Karia Butler. Love the details on the skirt. http://www.flickr.com/photos/myurbaneyes/477766547/
by "girl from finito: http://www.flickr.com/photos/girlfromfinito/6282326743/
and http://www.flickr.com/photos/girlfromfinito/6282843906/i which shows Tang influenced shoes.
by Kobby Dagan, hair detail. http://www.flickr.com/photos/kobbydagan/6558463135/
by Eric/Lisa Lee, same group as in the Jo Anseeuw photo above, Note the shoes peeping out from under the one girl's skirt!
http://www.flickr.com/photos/ericlty/512202996/

The matsuri re-enactors don't seem to have layered skirts, from what I've found so far, which would mean less to sew. I admit I could go either way on that.