My MiL isn't the type of mother who would notice whether her DS was wearing odd shoes, let alone socks. And wouldn't have when DS was a child. She was so wrapped up in her own marital issues, including constantly leaving DFiL and dragging her kids to her parents' place in the middle of the night, her own mother had to tell her to sort herself out or she'd end up having the children removed.
Absolute pearl of a mother who at one time thought she had first dibs on special events and wanted to be at the hospital for our DC's birth. DH shut that one down, fast as you like. We have been VLC for some years, and I am now completely NC.
Despite her own lack of attentiveness she still addressed me Mrs Hisname after 15 years marriage and repeatedly being asked not to. This is not because she doesn't know my actual name.
It seems odd that whether parents-in-law are attentive to the point of being overbearing, or whether they go to the other extreme and simply don't give a shit, there's a definite pattern of trying to put other women back in their box. A nice, moderate one halfway in between would have done me fine.
Happily I have no chance of winning OP's MiL now I've brought the lighthearted tone of the thread down with my miserable, curmudeonly comment. But anyone who wants mine is welcome to her! Don't all beat my door down now ...