During some of the scenes in the Draper residence Betty was wearing a cream/white shirt with a pattern on it which in my memory seems very similar to this pattern (I think she wore it with a tie of some kind just above the bump). Of course I can't find a shot of it online anywhere, if any one has any success please post it so we can compare!
However, I did find this shot and it seems to have a very similar collar going on which is interesting.
Maternity clothes aren't something that I'll ever need to be sewing for myself again but I would have loved to have tried some of these vintage patterns, maybe I'll sew them for others in the future!Happy sewing!
Anna