Costumes are 100k halos, a hefty price.
Many of the helpful extra items you can get are a fraction of the cost, and they help you gain magic and health back. This is especially important on hard mode.
After some minor testing, my conclusion:
Is it worth foregoing the benefits of better items, just to see Bayonetta in a leotard?
Yes.
Yes, absolutely haha. The costumes are really great, but maybe prioritize the resources 😅 but don’t let me tell you how to live your life.