Because they're talking about a sweater he wore in TASM 2 that was clearly not in TASM 1? You answered your own question. And congratulations, don't know why you need more than one pair I hope you got use out of them.
On a post with no supposed pics attached in a thread where the TASM1 costume is still adamantly discussed (can't go a few pages without mentions of the vince jacket, slacker backpack, fingerless gloves, etc...)- yeah, no opportunity for misunderstanding at all, especially when identifying the exact make/brand used in the first film...
And yeah, it was agreat find. Quality denim at a great price- Don't know about anyone else, but I like to own more than one pair of denim.