By Emma Thomasson BERLIN (Reuters) – Consumer concerns about poor working conditions in Asian factories and toxic chemicals used in fabric production are driving interest in ethical fashion, helping it start to appeal to a broader market. The collapse of an eight-storey garment factory in Bangladesh last April that killed more than 1,100 people drew global attention to the perilous conditions endured by many workers in Asia's garment industry, which supplies big Western retailers. Since then, labor unrest over working conditions has plagued the sector in Bangladesh and Cambodia. Awareness of these issues has helped ethical fashion start to shake off its reputation as a niche sector, said Olaf Schmidt, organizer of the Ethical Fashion Show in Berlin.