I do not believe thee is any written law other then dressing profane, In my humble opinion I think discernment is a factor. I would have to look in the mirror and consider my motive for dressing 'goofy' each day? To make someone laugh, to rebel, to get attention?. I think dress shows a sight of maturity. but heck there is no law. God did give us free will.
How others dress is a 'sigh' of maturity on a spiritual, emotional and professional level. To dress goofy for laughs or attention each day seems like it would take allot of work. Is it really worth it? What is the goal? If someone would be harmed or injured or offended then I would hope to choose to pass on 'dressing' in costume' If one needs attention I suppose the goal could get met by dressing in costume each day. .
For me using discernment would be key. Many Blessings to you.