'Everything's copyrighted and I will sue,' Green told Retail Week.
The retail tycoon will draft in a dedicated mystery shopping team to scrutinise other retailer's stores for copycat products when the Moss range launches on May 1.
'We've made a big investment and we don't want that undermined,' said Green.
Design theft is a constant problem in fashion retail and costs UK industry as a whole about£10 billion a year, according to the Alliance Against Intellectual Property Theft.
Green has ambitions to turn the Moss range into a global fashion brand and said he had received interest from about 20 retailers worldwide already.
The Moss collection will comprise 80 pieces initially, ranging in price from£10 to£200. It will be showcased in shop-in-shops at Topshop's most high-profile stores.
Green said new Moss merchandise would be introduced every seven to 14 days. 'We plan to add all the time,' he said. 'It's a brand-build.'
Moss was reportedly paid£3 million for participating in the venture and is the latest celebrity to lend her name to the high street. On Monday, H&M revealed that pop star Madonna's range helped drive like-for-like sales up 17 per cent last month.
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