Gap has appointed Dawn Robertson, previously managing director of the Myer chain, as president of its Old Navy division.

The US apparel giant said Robertson will join the company on 30 October. She has nearly 30 years experience in apparel retail.

During her four years at Myer, a top Australian department store chain, Robertson was credited for successfully repositioning the brand and improving its financial performance.

"We are very pleased to bring Dawn's deep merchandising and marketing experience to Old Navy," said Gap president and CEO Paul Pressler.

"She has a strong track record invigorating apparel retail companies, and I believe she will build an exciting vision for the future of Old Navy."

Robertson's previous roles also include president and chief merchandising officer of Federated Direct, a division of Federated Department Stores, executive VP of the Federated Merchandising Group for men's, kids and home, Prior and several senior positions across various divisions of The May Company for 13 years.

"I am thrilled to have the opportunity to work with the talented Old Navy team," said Robertson. "I look forward to helping shape the future of such an iconic fashion brand."

Robertson will be based at the company's San Francisco headquarters and will oversee all aspects of Old Navy's operations. She succeeds Jenny Ming, who left the company on 15 October.

Old Navy sales were down 3% in September. Gap has been increasing promotions at the chain as it battles against growing market rivalry.