Something old, something new
Something borrowed and something blue
And a silver sixpence in her shoe.
An old piece of lace might be used for tradition - though you might want to think hard about who wore it last, perhaps.
The same might apply to something borrowed - can you be sure their marriage was truly happy? If luck can rub off on you, what about bad luck?
There's nothing too sinister about a new dress, but maybe the silver sixpence suggests warding off misfortune. Certainly the knot of similarly dressed bridesmaids and the bride's own veil were meant to confuse evil spirits.
What about blue then? The colour of the sky and the Virgin Mary's mantle - a symbol of purity and faithfulness. There is also a rhyme 'Marry in blue, lover be true' - blue sapphires are often used for engagement rings.
Blue can be cold- photographers use blue filters to give an unnatural feel - and we talk about feeling blue. I'm not sure if that's quite what you want on your wedding day.