Two Switzerland-based global trade unions IndustriALL Global Union and UNIGlobal Union and brand representatives announced the agreement in Paris.
The current five-year campaign for fire and building safety expires next May and involves only European brands. Another group of North American brands is working separately to improve safety conditions in Bangladesh.
Following the collapse in 2013 of Rana Plaza, a complex housing five garment factories, global clothing companies joined the Bangladesh government in promising to improve safety standards.
Since then, representatives from North American and European brands have visited the country's garment factories to suggest improvements or sever ties with factories that failed to improve.
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The Bangladesh government has also hired more than 350 new factory inspectors and passed legislation setting up a workers' welfare fund and allowing stronger union representation.
The initial agreement covered about 2.5 million workers, Hoffman said.
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