Gap saw like-for-like sales at its international division, which includes its UK stores, fall by 12% in August.
Total group Gap sales were behind 2% to $1.12 billion (£684,857) and were down 3% on like-for-like basis. .
Gap chief finance officer Sabrina Simmons said: “During August, customers responded well to our denim collections at Gap and Old Navy. We were especially pleased by the progress at Old Navy and its strong back to school performance, which helped support total company merchandise margins significantly above last year.”
Sales for the year to date fell 7% to $7.49 bn (£4.57bn).