A friend attended our Burns Dinner tonight in a borrowed kilt, no sporran, and a blue blazer. He looked fine and got several compliments on the kilt, which he passed on to his friend, the loaner.
Unless the people you are dining with are insufferably stuffy, you will look great and have a good time. This was my first Burns Night (new thread? "Confessions of a Burns Night Virgin"?) and I had a great time. Saw people I had no idea were active in Scottish Heritage and got to reconnect with folks from festivals this past summer.
Go kilted and have a good time!