The sixth Ethical Fashion Report, released on Wednesday, graded 130 apparel companies, including 480 brands, from A+ to F on their policies, transparency, worker rights, and environmental management.
The 2019 report revealed Australia's best and worst performers alongside international brands, with Etiko, Outland Denim, Kookai, Cotton On and Country Road among those handed an A- or above.
Poor Australian performers included the Noni B Group, which owns brands such as Katies and Miller, swimwear company Tigerlily and discount clothing store Lowes.
Baptist World Aid CEO John Hickey says overall fashion companies have felt the pressure from consumers since the first report was released in 2013.
"People want to know they're not doing harm in what they're purchasing," he told AAP.
Last year there were 50,000 downloads of the organisation's ethical shopping guide, and thousands of others viewed the website and printed versions.
This year, the guide will be available through an app for the first time.
Governments are also turning up the heat through legislation.
Mr Hickey said the Modern Slavery Act, introduced on January 1, would make "waves" across the Australian fashion industry, which was worth close to $23.5 billion last year.
"The beginning of the supply chain is where the risk of child labour, forced labour and exploitation is most prevalent," he said.
The report revealed fashion brands rated most poorly on "worker empowerment", with a median D grade for this section of the report.
Nearly half of companies (48 per cent) had started to develop a living wage methodology, while 14 per cent of companies have projects to improve wages in the majority of factories, the report said.
Tanya Deans, Brand Manager at BONDS and its owner Hanesbrands, says working with third parties in the supply chain was one of the biggest challenges when aiming for ethics and sustainability.
Ms Deans said the company had scored an A partly because it owned a significant proportion of its manufacturing.
"If we own it, we can control workers rights in that process," she said.
While the company admits it's not perfect, Ms Deans said it was making a genuine effort to improve.
Some changes have come faster than others, with the company making big inroads in environmental sustainability by reducing greenhouse gases and water use, saving $10 million and reinvesting in local communities, Ms Deans said.
Brands with an A+ rating
Etiko, Freeset T-Shirts, Icebreaker, Kowtow, Liminal Apparel, Mighty Good Undies, Outland Denim, adidas
Brands with an F rating
Ally Fashion, Baby City, Bec and Bridge, Bloch, Camilla and Marc, C&M, Farmers, P.E. Nation, Lover, Cooper St, Rebecca Vallance, Jasmine & Will, Lowes, Beare & Ley, Merric, Pavement, Lemonade, Non Sense, Petals, Pom Pom, Co Co Beach, Zom-B, Scram, Wax, Showpo, 3 Wise Men, T&T, The Baby Factory, Cooper by Trelise, little trelise, Trelise Cooper, Jump, Kachel, Ping Pong, Wish