As your son's wedding is early in the morning, an outfit in a soft pastel colour would be appropriate.
A honey colour would also be suitable, but I would suggest that you stay away from white or cream.
Your outfit could be a suit, a dress or even a soft, flowing pants suit.
It would also be wise, before choosing your outfit, to meet with the mother of the bride and discuss in advance what colour she will be wearing, to ensure that you don't clash with each other in any way.