X Men III Wolverines indestructible pants

In X Men: The Last Stand s finale, Phoenix Jean Grey is literally tearing reality apart and ripping people into nothingness. Wolverine battles his way to his unrequited love, skin ripping from his adamantium frame. His life is being destroyed. But,weirdly, not his pants. They seem to be made from something even stronger than adamantium. No peek of a Wolver willy for us then.