Leading Japanese casual wear giant and owner of the hit Unqilo fashion label, Fast Retailing Co Ltd, on Friday posted a 39.9 per cent plunge in July same-store sales - its tenth consecutive fall in monthly sales.

The company said in a statement customer visits slumped 33.5 per cent in July from the year-ago period in the wake of a 29.4 per cent fall in June, with per-customer spending down 9.6 per cent last month.