Hmm. Well, which type cares most about cleanliness and appearances? That seems like some sort of SJ to me, possibly a Fe user as well--I imagine that they would feel embarrassed if it were discovered that they were unclean. I'm not sure an intuitive would actually care so much. So, my guess for the posed question is ISFJ. Therefore, it stands to reason that all ISFJs use two-ply paper.
If you type yourself as ISFJ on this site and you don't use two-ply paper.. well, you ought to think again about your type, because you're probably inaccurately typed.
Type is a valid predictor of the number of preferred plies. To argue otherwise is inane and baseless.