The old saying "something old, something new, something borrowed, something blue and a silver sixpence in her shoe" dates back to Victorian times. But hitched.co.uk has a lot more to say about what it really means:
Something old represents the link with the bride’s family and the past. A common solution many brides choose is to wear a piece of family jewelry or their mother’s or grandmother’s wedding dress.
Something new represents good fortune and success in the bride’s new life. The wedding dress 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. The borrowed object might be something such as a lace handkerchief or an item of jewelry.
Something blue symbolizes faithfulness and loyalty and dates back to biblical times when blue represented purity. Frequently the bride’s garter is the blue item.
A silver sixpence in her shoe is to wish the bride wealth, both financial and happiness.