I figured out that the new clothes are "jeans" have multi layer functionality. you can see if you have stockings under them, espesially the one with holes.
Which got me thinking that all the old clothes dont seem to have that. No matter what kind of underwear you have bra/panties/thong, and it just seems to over write whatever is under like they never excised. So they pop up the moment you remove the outer wear of clothing..
I will attach a picture of what im thinking so you get examples.