Stupid question, but do you have to wear a suit to a summer wedding? I haven't been to a wedding in a long time and my old suit fits horribly. I was wondering if it's okay to wear dress pants, collared shirt, tie, and a blazer. Thanks. It's always better to wear a suit a wedding. Put formality and appropriateness to a side, dressing up also shows respect to the couple. Of course, there are many "casual" weddings now in which case it may be okay to dress down. However, when in doubt, wear a suit. Summer should not be an excuse, since there are summer suits.