Excluding access to website pictures

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My wife's shop Norma & June Fashions specialises in mother of the bride outfits. The website at www.thebridesmother.co.uk is packed with lots of pictures of the designer fashions she sells.
We are aware that we get lots of website visits from Chinese IP addresses and are concerned that the Chinese are using the pictures for cheap reproduction of the designer outfits shown.
We have met a few purchasers of the copies of some of the outfits after they visited the shop following a purchase from a Chinese internet site. We know the cheap copies to be shameful at best.
My request is to find some way to prevent a Chinese IP address from even accessing our site, let alone copy any of the pictures.

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