A formal wedding, of course, will be the most expensive and the informal, the least.
Nothing is set in concrete.
Unlike a decade ago, the lines are no longer rigidly drawn. The burden of paying for the wedding has shifted in recent years from the shoulders of the father of the bride, to include the groom's family. Also, with many couples marrying later and having money of their own, they are sharing in the expenses. We respect your privacy. Show the wedding party you care by giving them their own t-shirt proudly stating who they are in the wedding party.