Are Pinstripe suits appropriate for weddings?

if you are not part of the ceremony, you can wear whatever you like, as long as your clean and neat. If you are in the ceremony, your dress will be pre-ordained by the planners .

Where on earth did you get the idea that weddings call for a standard black suit? Good grief.. What on earth would make you think a pinstripe suit isn't appropriate?

If you've already got the pinstripe suit, it's fine - maybe think about wearing a coloured rather than white shirt to make it less 'work'

They can be, depending on the formality of the event.

A suit is fine to wear to a wedding. Pinstriped or otherwise you are good.

As long as it is a suit and not a tuxedo, you're good. A tux would only be appropriate if it was a black tie or formal wedding where everyone was expected to be in formal attire.

I think it's appropriate, as long as you're not in a tux like the groom.