As a twin mum I have to say the planned/mistake babygrows did make me laugh! Mostly because you get so many people assuming you had IVF so it's one way of fending off that conversation. Wouldn't be brave enough to dress them in it in public though...
I despise the whole 'Daddy's little princess' stuff, we were given a whole set of hand-me-down stuff with that, 'Pretty like Mummy' and, completely inexplicably, 'Bunny's Little garden' on it. There wasn't a rabbit motif, nothing, it just MAKES NO SENSE. Lazy design, gah.