Nighties wern't vintage then just a normal nylon nightie in thoses days. My Mother got me into vintage nighties in the 60's.
'Phil'.That is such a 'Sweet Story' about you and your Mom.My Sister-In-Law has got me into being a 'Crossdresser'.I have 'Natural Big Breasts' (46B/46C-Cup).She gave me one of her 'Old Bras' to try on.Her Bra size is a 46D-Cup.Cup size was 'Too Big'.She took me 'Bra Shopping'.We found the 'Right Bra Size' for me to wear.