It's a matter of style. If someone who typically doesn't wear pants like green corduroy pants to school, I'd wonder about it, maybe ask them. But if they do, I wouldn't cast judgement, unless they wore something that didn't match. Those are some serious pants- they aren't JEANS. You don't just WEAR green corduroy pants for kicks and giggles. You wear those with a purpose. Which is why you should also take stock in the rest of your outfit.
So, if the guy pulled them off, I would think, 'Wow, good outfit today!' but if he didn't, I would say, 'Better luck next time.'
I would think that person is quite interesting. I'm all for people who think outside the box when it comes to fashion. This link shows a great example of a guy who really pulls off the green corduroy look.