I assume you mean what we think about the idea of using it as an excuse to wear in public? I think any adult who does more than drink or take their kids trick or treating on Halloween is pretty pathetic. Would really advise against going to a party dressed as a baby unless everyone there is also an AB/DL. I think that would be nice. Like having a private little Halloween party and bob for apples and stuff like that. But i'm sure in reality any "munch" that isn't all tumblr personalities would be gross.
Other than that you don't need an excuse to wear under your regular clothes. If you're not making it obvious nobody cares or even notices.