Now I don't totally agree, but I do in part. If it's his event and they have stuff that's appropriate, in WHOEVER's house, it's appropriate for tehm to be able to wear it. But if they dont' have it, he should supply it. If he's NICE he'll do as we do and let them take it back to their mother's house when they're finished if they want, or he can keep it and only send it over if she requests it for her own special events... but it's kind of being nasty if she HAS stuff and doesn't let him use it (without a history of him shredding it on his time, and though he doesn't treat causal clothing well, there's no history of him shredding the good stuff).

But on the issue of stopping all the worry about whether he's going to mock her for not buying stuff for his event? Yeah, I agree. STOP!