The London-listed company commissioned a review last July following British media reports about factory working conditions and low pay in Leicester in central England.
The Sunday Times newspaper reported at the time that workers in a factory there were making clothes destined for Boohoo were being paid as little as 3.50 pounds ($4.89) an hour.
Boohoo in March announced it was consolidating its list of British suppliers after accepting recommendations of the review.
"Suppliers are visited more frequently, sub-contracting has been removed, products can only be purchased from our approved supplier list; mandatory whistle-blower helplines have been installed at every supplier," Boohoo said on Friday.
($1 = 0.7156 pounds)
(Reporting by Pushkala Aripaka in Bengaluru; editing by Jason Neely)