Often the bride will wear an heirloom, or maybe carry a family bible or prayer book, the dress of course is usually the something new, and they will borrow something from someone to wear. The something blue can be difficult, but a lot of brides get round this by wearing a blue garter under their dress.
Within the "white wedding" tradition, a white dress and veil would not have been considered appropriate in the second or third wedding of a widow or divorcee. Nowadays it really isn't an issue.
- See more at: http://www.learnenglish.de/culture/marriage.html#sthash.tvGncip2.dpuf