UPDATE: it turns out that this is not an OLED dress at all! It is using EL panels, made by Elumin8 back in 2005. Here's more information...
UK's PolyPhotonix is showing an 'OLED Dress', designed by Gareth Pugh. The dress was exhibited at the launch of the UK's "Plastic Electronics Strategy' (the $32 million investment in plastic-electronics announced in July). The UK announced that by September 2010, they will begin prototype production of flexible OLED Lighting panels and low-cost long-life solar cells.
PolyPhotonix are working toward polymer-based OLED Lighting panels. Their first production line is already active (that's where they made the OLED panels for the dress).