The supermarket chain, which has been trialling its online service since August last year, said its TU womenswear, menswear and childrenswear are now available for next day delivery or for click and collect at 710 stores, including 112 Sainsbury’s Local.
Around 400 Sainsbury’s stores currently stock TU clothing, although only 160 carry the full collection.
The move online marks a further strengthening of Sainsbury’s position in fashion, where it competes with Tesco’s F&F brand and George at Asda.
Under general merchandising director James Brown, the company has doubled the size of its design team and brought the TU range more in line with catwalk trends by introducing fresh lines into stores every six to eight weeks.
The brand now generates around £800m of sales, making Sainsbury’s the UK’s seventh largest clothing retailer by volume and 10th largest by value.
Sainsbury’s online director, Robbie Feather, said: “We are focused on providing excellent quality and value, with a talented in-house TU design team. This launch is in line with our mission to give customers access to our products and services whenever and wherever they want and will significantly increase the reach of our already successful TU brand.”