Would anyone like to buy a t shirt?

The case was actually about passing off, and was based on the fact that Top Shop were selling tee shirts with Rihanna's image on at a time when she had an endorsement deal with rival store River Island. Rihanna won simply because the court was satisfied that Top Shop were trying to cash in on Rihanna's goodwill as a fashion icon. To make matters even clearer, here's part of the concluding paragraph of the judgmentIt is important to state at the outset that this case is not concerned with so called 'image rights'. Whatever may be the position elsewhere in the world, and how ever much various celebrities may wish there were, there is today in England no such thing as a free standing general right by a famous person (or anyone else) to control the reproduction of their image.
So since that appears to be the sole justification offered for not printing your tee shirt, the company have badly misinterpreted the law. What is more, despite the reference to the new parody fair dealing exemption, that has nothing to do with image rights either.The mere sale by a trader of a tee shirt bearing an image of a famous person is not, without more, an act of passing off.