I was just replaying some FO1 the other day when I noticed Jacoren's (The Overseerer's) vault Suit. It appears to be very thin and tight fitting. However, FO2's vault suit seems to be, for the most part, in tact and still wearable (after 80 years), meaning it must be pretty strong (and flexible, and tight). So my question is, what do you all think the vault suits are made of...?