Well, it's as good an explanation as any for the boots. It's also a reminder that not everything has to have a comedic or chaotic explanation. Sometimes, a mundane story is just as valid and still lead to a joke! I do think that we have really only seen the beginning of the affects of this night for the Augustus family. Think of the family get-togethers!
Yeah, Claire can pull off 'dorky', can't she? Maybe, in the end, it's all about the attitude! It's also very in-character for Claire to somehow mix mockery and support when talking to her brother.
Of course, having a significant other who is into it in a big way is a heck of a motivation for excelling in your chosen aesthetic! That said, we may see Claire experiment with other looks as her self-confidence grows. Marten may be in for a ride, as far as that goes!