I gotta agree here. When parents use cloth diapers they may use plastic underpants, but that is it. Cloth diapers were not really very popular among the wealthy back in the early/mid 90's, and if they were, PR - the mom who had nothing else to do but raise kids but she got herself a full time nanny anyways - nah she wouldn't do this. Cloth is a ton more work, and something only the severely environmentally green moms do, not someone like PR.
Diapers do not go down to a child's knees like these size 12 did. They reported she wore pull-ups. With those, they are designed to replace underpants and feel just barely more padded than underpants. They're designed to be the inbetween phase of diapers and underwear. On children they are maybe a 1/4 inch thick. A disposable diaper (not pullup) is at most 1 inch thick. For those panties to fit over them and for that to be the reason, the diaper would have to be like 8 inches thick or more and that's just ridiculous. I babysat many kids in the 90's during this exact time and I can promise you size 12 panties over any kind of available diaper is nonsensical and also would not fit or work.
These panties were not used normally. This was an abnormality this night. When questioned about this, PR starts lying. Red Flags. She overestimates the size of panties JBR usually wore. She underestimates the size of the panties she was found in. She underestimates the difference in size the between the two, and she claims JBR put them on herself from her underwear drawer even though investigators only found size 4 to 6 underpants in that drawer and they pulled out like 15 of them.
They are a part of the crime scene, the Ramsey's were part of this, knew about the panties, and we can tell this based on PR's attempts at distancing, lying, and exaggerating around this topic.