After watching X-Men: The Last Stand on TBS, I say that any debate regarding what pant is most durable, most impermeable, or most manly, has to include the sweet leather pants that Wolverine picked out when getting himself dressed on the morning before he killed Jean Grey. (Who is crazier than the astronaut lady). But I guess if you really think about it, Jean Grey never found herself wearing diapers, so..
In the clip below, Jean Grey is really freaking out, "Ok, we got ourselves a Situation". Wolverine has to stop her/kill her before she blows up Alcatraz or something along those lines. As you can see around :30, as Wolverine approaches her, he gets fucked UP; Jean Grey is so powerful that at :35 Wolverine's jacket plain gives up and disintegrates. Worse, the incredible force melts Hugh Jackman's striking features, and suspicious handsomeness right off of his face. Luckily for all of us, Wolverine's genetic mutations allow him to respawn his good looks.
What is the only thing that stays completely intact throughout the affair, that is unaffected by the rage of a stage 5 mutant? The pants.
I think we deserved a peak at the goods, or at least a just-time-traveled-Terminator type reveal. But no, I forgot that Wolverine was wearing his special pants. I wonder if they came pre-ripped.