I'm having a bit of trouble coming up with my "something old" and "something borrowed," so I was looking up wedding traditions today and came across this explanation of the traditional wedding attire.
"Something Old represents the link with the bride's family and the past. Many brides choose to wear a piece of antique family jewelry or a mother's or grandmother's wedding gown or handkerchief.
Something New represents good fortune and success and her hopes for a bright future in her new life. The wedding gown is often chosen as the new item.
Something Borrowed is to remind the bride that friends and family will be there for her when help is needed. 'Borrowing' is especially important, since it is to come from a happily married woman, thereby lending the bride some of her own marital bliss to carry into the new union.
Something Blue is the symbol of faithfulness and loyalty. Often the blue item is the garter.
A [Lucky] Sixpence in her Shoe is to wish the bride wealth. Some brides still place a penny in their shoe during the marriage ceremony."