Quoting Legendary Amanda:" My kindergartener has mentioned it on several occasions (hopefully only to me) That some kids wear clothes too big/ small or have holes in them."
That's so sad - not that your daughter takes notice - it is only normal to recognize things that are different to what we know...but that there are still kids out there who don't have clothes that fit properly.
I think I thought of this question as in when did kids start making fun of...but taking notice? My 4 year old compliments her friends at PreCC on their clothes and shoes. She's never said anything about anyone who's clothes weren't "nice" though.