I'm looking to dress up a bit for a casual wedding in Nov. With my sewing skills being rusty, I thought I would ask now so I could get underway if needed.

Are there any alterations needed to a vest or waistcoat that I would get from Goodwill or a Savers to work with my kilt or would it be wearable off the rack? Or would I do best getting one from ebay or used from a rental shop?