STOCKHOLM--Sales at Hennes & Mauritz AB declined for a fifth consecutive month in February, underscoring the difficulties the once-thriving clothing retailer is now facing in appealing to discerning customers in the intensely competitive fast-fashion market.

H&M said on Friday it has opened 327 stores in the past year, helping total sales to increase 5% in February, but sales from stores open more than a year fell 3%.

A quick glance at the Stockholm-based retailer's competitors around the world shows that customers are still shopping, just not at H&M's stores. Spain's Inditex SA, which owns the highly successful Zara chain, reported an annual sales increase of more than 16% earlier this week, while Japan's Fast Retailing Co., which operates the Uniqlo brand, said like-for-like sales in February were up 9.6%. Even U.S.-based Gap Inc., which has previously come under fire for poor fashion choices, reported an 11% sales increase in February and hasn't seen a drop in sales since last April.

But H&M is struggling to find its niche in the changeable world of high-street fashion. Zara capitalizes on a lightning-fast supply chain which, with 50% of its clothes made in Western Europe, means it can capture catwalk and luxury trends and have them available at its stores within weeks--something customers are prepared to pay a premium for.

H&M's longer supply chain means it can't compete as fast on fashion, so it tries to do so on price instead: H&M is on average about 60% cheaper than Zara. But it is still more expensive than budget competitors such as Primark, owned by Associated British Foods PLC, and U.S. chain Forever 21, leaving it struggling to position itself.

While H&M's fashion designer collaborations and celebrity collections get a lot of media attention--actor Helen Hunt attended the Academy Awards in a specially designed eco-friendly H&M dress--most of its ranges comprise basics such as T-shirts and trousers, for which customers tend to shop around to get the best price. Primark, for example, is about 50% cheaper on comparable products and also recently opened a distribution center in western Germany that could lead to significant new store openings in the country--H&M's biggest market.

Bernstein analyst Jamie Merriman thinks H&M has two choices. Either it must cut prices in response to the growth of lower-priced competitors and put further pressure on its margins. Or it should stop trying to compete at the bottom end of the market and start targeting customers who are prepared to pay more, through products such as its recently launched Conscious Collection of clothes made from organic cotton.

"The question is how successful they can be in convincing customers to pay a higher price for their products," said Ms. Merriman. "It's still early days."

H&M in January announced the coming launch of a new line of stores called & Other Stories, aimed at a more affluent shopper. But Ms. Merriman said that while the launch of & Other Stories is a good long-term strategy, it won't make a difference in the short term as new store concepts take a long time to become established. Inditex's Massimo Dutti brand, for example, has been around for 20 years and now has 500 stores, but still only accounts for 7% of company sales. So H&M's launch of seven new stores "is just not going to be meaningful for group results," said Ms. Merriman.

Write to Jens Hansegard at jens.hansegard@dowjones.com

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