Not much to say other than list some niche stores that are worth looking into. Let me start it off.
Most people have probably heard of Not Just A Label. The founder goes to grad shows and gives a platform for the young designers sell their clothes.
http://www.notjustalabel.com/shop/womenswear
http://www.notjustalabel.com/shop/menswear
On a similar vein, there's also http://www.Muuse.com, they sell some RTW pieces from grad students, but most of the fun stuff are made-to-measure. The first time it launched a few years ago, they listed the prices of the MTM garments, which cost upwards of 500 euro for a simple dress and the complicated stuff were priced at 2000-8000 euro. Cheap, I know, but still worth perusing anyway.