Damn, that's just weird...I think OUAT is a show for everyone! Nothing in its marketing says that it's a show with a mainly female target audience (unlike, say, PLL or something), so I don't see the reason why they'd use girls' sizes...most stores that sell march use unisex sizing, from my experience, unless it explicitly is designed for a girl's body. T-shirts are supposed to be...t-shirts, unisex! >.<
Unless of course, it's a Hot Topic thing, as their primary customer base caters to females? I don't think it should be an excuse though, as there's a new collection coming out...and they have Hook-inspired coat for both guys and girls (I'm so getting one...I want to be slutty Hook for Halloween). Then again...why don't they have Regina-inspired stuff coming out for guys? Or why not even Emma's jacket for guys? The cut works for both sexes! :O