folks, we can all agree to disagree but the way tznius works is not by putting up one master list of every garment and material of clothing and listing assur or mutar.
a lycra shell that is two sizes too small on a woman is not tznius. a lycra shell which fits her properly (i.e room to breathe)is fine same goes for ANY material.
what i dont get is why would a person where something so tight that you can see their dinner digesting?