I have older JMS "COTTON" Panty Briefs, wore only JMS for years.  However these do not feel the same, these feel more Slick, like nylon, polyester, ETC.  I prefer Cotton as I like air flow, better then with nylon or poly.  These are also a bit tighter then I expected them to be.
Label reads Cotton??? Will go up a size, Better loose then too tight!!
*Crotch Panel* = cut wrong OR sewn wrong.  Has a wrinkle/skewed cross ways causing a crease/bunched fabric.  Won't Lay flat. Irritation.
Buying another brand from now on.  No longer "MY" ANYTHING!!!