Clothing and footwear prices fell 5.9% year on year in March, amid “intense” discounting on the high street.
Prices were down 0.3% on February, the British Retail Consortium’s (BRC) Shop Price Index shows.
BRC chief executive Helen Dickinson said: “Customers have now had the benefit of four years of non-food price deflation. Looking across both food and non-food, shop prices in total have been falling for 47 consecutive months. The squeeze on household disposable incomes will tighten as the year progresses.
“Looking ahead, ensuring the continuation of value for consumers through tariff-free trade must be at the heart of plans for a smart Brexit.”