Sales growth rose at Swedish budget fashion firm Hennes & Mauritz in May after unusually cold spring weather in Europe had capped growth in previous months.
H&M, the second-biggest clothing retailer after Zara owner Inditex, said sales in local currencies rose 9% from a year earlier.
That was slightly below the 10% mean forecast in a Reuters poll of analysts.
The acceleration came despite a 1% decline in overall clothing sales in Germany, H&M's largest market, and a decline in the US.
H&M said net sales from March to May, its fiscal second quarter, rose to 46.9 billion crowns ($5.6 billion) from 45.9 billion, missing an analysts' forecast of 47.7 billion.
Monthly fashion sales trends can be volatile depending on weather and H&M cited an unusually cold spring in some markets after sluggish sales growth in March and April.
But some analysts and rivals have expressed concerns that sluggish sales at some clothing retailers also indicate slowing underlying demand in some markets.