Score!
I found out what Ayu was wearing, and probably what she's trying to represent/be in the PV..

What she is wearing is a "juunihitoe" or 12-layered kimono.
Quote:
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The costume of high-ranking ladies-in-waiting in the court from the Heian period ( 710-94 ) onward consisted of 12 or more layers. Colors passed down from olden times often come from the names of flowers and plants. Various hues of pink, for example, include sakura ( cherry blossom or pale pink ), momo no hana ( peach blossom or bright pink ), koobai ( dark pink plum pink ). Many tints of green are named after plants : wakakusa is the bright lush green of new grass in spring, aodake is the bright green of new growth bamboo, and oitake is the dark, grayish green of the mature bamboo trunk. Other color names come from plants grown specifically for dyestuffs such as benibana ( safflower ). One of the most favored colors of the Heian period was the bright yellow of the yamabuki flowers of a variety of rose ( Kerria Japonica ).
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Historical tidbits in an Ayu PV?! D:
So now we know what it is..