My husband's best friend is getting married in July 2016. I know I have plenty of time, but I like to plan ahead. My husband is in the wedding, so no issue there, but the wedding is a formal Catholic wedding. I have no idea what I'm suppose to wear. All the weddings I've been to have been casual or semi-formal. I do know that it is formal, not black-tie (which I didn't know there was a difference!). Any suggestions?