Firefighters battled through the night to douse the inferno at the Aswad Knit Composite factory in Sripur on the outskirts of the capital Dhaka, which broke out when most of its 3,000 employees had gone home.
Workers said the blaze appeared to have been started by a malfunctioning knitting machine, while the country's top inspector said safety problems had been raised last month.
Police said most of the bodies found today after the flames were extinguished were too badly burned to be identified.
An AFP correspondent who picked through the still smouldering wreckage found work order books containing names of clients in September including US brand Gap, British retailer Next, Swedish fashion label H&M, Australia's Target and France's Carrefour.
H&M, Gap, Next and Carrefour said their clothes were not made in the factory, but admitted they placed orders with the owner, Palmal Industries, one of the country's largest garment groups.
"Once the cause is known, as routine Next will review its procedures, including the extent to which it needs to look further down the supply chain -- particularly in high-risk areas such as Bangladesh," said a statement from the British retailer.
