French lingerie, underwear and clothing retailer Etam Developpement on Friday posted a year-on-year 6.5 per cent jump in first half sales to 532 million euros. The Paris-based group, owner of the Etam Lingerie and Tammy chains, said on a like-for-like basis sales increased 2.5 per cent in the first half. It also recently closed its loss-making 123 lingerie chain.