In my chapter we gave our little sis a white hankerchief on her initiation day, and it's embroidered with her name, initiation date, and our letters in gold or silver. The idea is that you'll tuck it in your garter when you get married.
I've also heard of brides putting a white carnation into their bridal bouquet (this probably only works if your whole bouquet is white), and I've definitely been a part of some fabulous chi o singing at various weddings, but I think the hanky thing is my favorite!
