SXSW features plenty of fashion. Some official, some impromptu. Here's some of the fashion that appeared at the SXSW conference.
Fur Face Boy t-shirts available at http://www.furfaceboy.com
Heyday Footwear available at http://www.heydayfootwear.com/
The Good Child t-shirts available at http://officialgoodchild.com/
Process apparel available at http://wearetheprocess.com/