Pencil test

Question:

 i wanted to know if the pencil test was real and
if every girl does it or is it just the books.

Phyllis replied:

An advice columnist of years ago suggested that as a way of determining whether ot not your breasts were large enough that you should wear a bra in public.  I don’t know if other girls tried it, but I did.  I know that I’m going to get a zillion letters asking in what Alice book the pencil test appears, and I don’t remember, so please tell me so I can list it here.