Odd Pants-Very fine pinstripe

I say nay. They are suit trousers, even if there is no matching jacket, because they are made of suiting. I think they'd clash with any jacket, but they'd go decently well with knitwear.

Nay. Agree with Matt's opinion.

Grazzi!

Off to Goodwill.

You could wear them with a contrasting vest. Grey perhaps and a tie and you would just look like you were wearing a suit without the jacket. I don't know that it's a bad look if you aren't going anyplace that requires a coat, anyway. I frequently don't wear a suit jacket around the house or office and I seem to get away with it...

Nay, in bold letters.