I think this is a little weird and creepy.
My daughters have only worn my stuff for 80ís parties or a black formal dress I have that never goes out of style.
Otherwise, those sleeves are too long on her wearing moms stuff
Once during a school carnival party, I must have been about 15 years old, I wore my mother's only neat position dress. During her pregnancies, my mother barely needed real and neat maternity clothes. She often had only a small belly, not many other major physical changes. The clothing was also more spacious at that time. She bought / made this dress because of a party when she was about 8 months pregnant of one of us (me or my elder siblings). The dress suited me very well, just a little extra fabric in the belly area. I was built slightly coarser than my mother in her younger years. Many were surprised how well the dress suited me.