The sale is expected to be completed by mid-March and will include up to 106 stores.
In a statement, KPMG confirmed the sale would likely save up to 680 jobs, and that it was conditional on landlords agreeing to revised lease terms with Harbour Guidance.
KPMG restructuring partner James Stewart said the sale was good news for the business, employees and consumers.
"This is a great result for all parties," Stewart said.
"Retail is a people business and the administrators greatly appreciate the resilience of the Jeanswest staff through the administration process."
Harbour Guidance managing director George Yeung said it marked a fresh start for the brand.
"The acquisition of Jeanswest business will present an opportunity to rejuvenate this iconic brand well known to the Australian community," he said.
"We are committed to continue servicing Australian communities and grow the Jeanswest brand organically through an omnichannel service offering."
The much-loved Australian retail brand opened its first store in Perth, Western Australia in 1972 thanks to founder and denim king Alister Norwood, and today the business employs 988 people in 146 stores across the country.
It is best known for its popular denim range as well as maternity wear and other wardrobe staples as well as the slogan "Jeanswest fits best".
It is understood Jeanswest's operations outside of Australia are not affected by the administration process.
In January, KPMG announced that as part of the Jeanswest restructure, 37 stores would be closed and 263 employees would be made redundant. It is understood these stores could not be saved as part of the sale and will still be shut down.
