Hah, well, it's still a funny thought. Personally I wouldn't ask him to sign anything except a book or a coffee mug maybe. *makes a note to buy a coffee mug from the online store if it ever looks possible to get an autograph*
Though granted, there are two ways to read the comment -- I'm not sure if she meant asking him to sign while she was wearing the merchandise or not, that could make a difference. *grin* Though either way I suppose asking to sign such a garment would be a bit off.
Again though, hah, this is funny not serious.