Leading Japanese casual wear giant and owner of the hit Unqilo fashion label, Fast Retailing Co Ltd, on Tuesday posted a 29.9 per cent plunge in August same-store sales - its 11th consecutive monthly sales fall. The company said in a statement that customer visits slumped 24.3 per cent last month from the year-ago period in the wake of a 33.5 per cent fall in July. In the fiscal year ending last month, customer visits slumped 24.7 per cent year-on-year.