This outfit is heavily inspired by the Russian feminist band Pussy Riot. As you can see, Tanner is wearing a grey balaclava, bearing the symbol of feminist ideology. The balaclava was fashioned from an old sock. The dress is intentionally ugly and badly stitched, to reflect opposition to traditional feminine beauty standards.
The chains are representative of members of the band being imprisoned.
The balaclava features holes to accomodate Tanner's mouth and eyes.
Listen to "Putin Lights Up The Fires" by Pussy Riot and read the lyrics here: http://www.theguardian.com/commentisfree/2012/aug/20/pussy-riot-new-single-lyrics
