International brands are using Certilogo (www. Certilogo.com). Using a code placed on the clothes you can easily, for purchases on internet, both in the store verify the authenticity of the goods.
Soon even the brand Diesel affix a special label on the inside of their clothing that will be verifiable with Certilogo. Although few know this method that would help italian companies to fight counterfeiting, which causes them a loss about 4 billion Euros in revenue per year.