Well, in a boy to girl dress up story, the initial idea or trigger is crucial. It might be inspired by seeing a girl's style he likes or being part of a themed event. Next, the actual process of dressing up matters. He has to select the right garments, maybe a flowery dress or a skirt. Accessories play a big role too, like a girly scarf or a hairpin. Also, the boy's own feelings during the transformation, whether he feels shy, excited or confident, are important aspects of the story. And of course, how people around him respond is also a key element.