Leave it to Gavin to mean to say something nice but still manage to sound like a dick in the process.
To clarify the “mask vs. cute costume” argument: they don’t really make a lot of girly costumes that have masks. Guy costumes get masks, gore and weapons. Girl costumes get sex appeal, glitter and accessories. I mean, there are always exceptions of course, but that is the majority.
Ryan probably grew up being stuck with cliché boy costumes his whole life, like reapers and vampires and devils or something. So Rain is longing for the opportunity to finally be something more feminine, like a princess or a faerie or what have you. You know, something cute. Something ultra girly that she couldn’t have ever gotten away with in her childhood.
Said costumes tend to be exceptionally “showy” though. Rain might want one because they’re decidedly girly, but at the same time, fears them for being able to easily out her if she’s not careful.
Rain, all characters and all other aspects of the story are copyright material belonging to me.
Rain could totally pull off a Fluttershy look :D