First off, you need to ensure the captions don't promote any kind of harmful stereotypes or objectification. Also, make sure they are age-appropriate and don't violate any moral or legal standards.
The main things to think about are the material - it should be soft and comfortable. Also, the design and pattern should be appealing to the girls. And of course, the size has to fit right.
When choosing, look at the quality first. Good quality means it won't wear out quickly. Also, check if the elastic is strong but not too tight. And it's nice if the underwear is easy to wash and dry.
You could go for something like 'When boys embrace their feminine side' or 'Boys in girl's clothing: A new adventure'.
Commonly, these captions could focus on the contrast between expected boy behavior and the girlish portrayal. It could also involve using funny dialogues or expressions to highlight the transformation.
Pattern and design matter too. Kids usually like underwear with their favorite cartoon characters. Also, check the quality of the fabric to ensure durability.
The brand can matter too. Some brands are known for better quality. And of course, check for any special features like anti-microbial or moisture-wicking if needed.
Maybe it's for some kind of artistic expression or to create a specific visual effect.
Maybe it's for adding a unique twist or exploring different gender expressions. It could be to create an interesting plot or challenge societal norms.
You need to think about the material - it should be soft and breathable to keep kids comfortable. Also, the design should be cute and kid-friendly without any sharp edges or uncomfortable tags.
Depicting cartoon girls in underwear might be a misguided attempt at being 'unique' or generating controversy. However, it usually just raises ethical and moral concerns and doesn't contribute positively to the medium of cartoons.