From Hannah Booth’s article in The Guardian Weekend:
One of the more striking things about these people posing in their T-shirts is how un-posey they are. Only Popeye is apeing the stance of the cartoon sailor on his back, but you have to look closely. You can almost see him smiling, too. The rest, told to “do what you want,” stood up straight, arms down–no Usain Bolt shenanigans here. Girls were more likely to put their hands on their hips, says the photographer Susan A Barnett, but then she found few to shoot: slogan T-shirts, it appears, are a peculiarly male preserve.
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