Perhaps they were doing some sort of fashion experiment. They might be interested in seeing how tights would look on a male figure and how it could change or challenge traditional gender - based fashion norms. Or it could be that they were simply being mean and trying to embarrass the guy without any deeper reason.
On the other hand, he could potentially feel curious. Once he actually puts on the tights, he might start to see things from a different perspective. Maybe he'll realize that fashion doesn't have to be so strictly gender - divided. But overall, the initial reaction is likely to be negative, whether it's embarrassment, anger or just general discomfort at being forced into an unusual situation.
It could be for an art experiment. Maybe she is exploring gender norms in fashion through her art. By making a guy wear tights, she is challenging the traditional ideas of what men and women should wear. Also, it might be for a bet. She could have made a bet with the guy or with her friends that she could get him to wear tights.
One reason could be as a form of punishment. For example, in a military camp, if a soldier breaks a minor rule, his comrades might play a prank and force him to wear girls' clothes as a light - hearted way to teach him a lesson. Another reason could be for entertainment purposes, like in a comical skit where they need a male to play a female role and there's no other option but to force someone into it.
For fun. Just like in a party or a casual gathering, girls might think it's hilarious to see a guy in a dress and it can create a really jolly atmosphere.
Another possibility is in the context of a family with very traditional or gender - role - blurring ideas. The family might be involved in the arts or some form of self - expression where they don't see makeup as strictly for girls. So, they might have forced the boy to wear makeup to introduce him to this form of self - adornment.
Perhaps in the story, it was a cultural or family tradition that was misinterpreted. Maybe the family had a tradition where boys and girls had to swap clothing for a certain event as a symbol of equality or something, but the boy didn't want to participate this time and was still forced to wear the skirt.
One possible reason could be as a form of punishment. For example, in a school or military setting where there are strict rules, if a man breaks a particular rule, his peers or superiors might force him to wear a dress as a way to humiliate him. Another reason could be for the purpose of a bet or a dare. Maybe he lost a bet among friends and had to abide by the terms which included wearing a dress.
One possible reason could be due to a medical condition. Maybe she has some bladder or bowel control issues that the adults around her think are best managed with a diaper for the time being. However, this should still be done with her understanding and cooperation as much as possible.
Maybe it was a cruel prank by some bullies who wanted to humiliate the boy.
One reason could be bullying. Other kids might force him to do it as a form of humiliation. Another reason could be some sort of dare or prank within a group that got out of hand. Maybe there are also cultural or family issues where someone with more power in the family or community forces their idea of 'gender - bending' on the boy without his consent.