THANK HEAVEN FOR LITTLE GIRLS

Here they are, little girls looking their most angelic, all dressed up in wreaths and carrying baskets of fresh-picked flowers. If you're considering adding one, two or even more little girls to process down the aisle, really dress them up so your wedding will be all the more special. If you're wearing a ball gown and like the storybook theme, go all out. Put your girls in tulle dresses with floral wreaths on their heads. Present them the gift of ballet slippers to wear. They'll cherish these long after the wedding.
If it's a more casual wedding and/or money is tight, here are some options: Find her a special little cotton or linen nightgown she can use afterwards. She'll look Kate Greenaway chic in it, especially if she goes barefoot. Remember, barefoot is okay on kids, particularly at an outdoor or beach wedding. The trick to getting away with this informality is making sure the rest of your little one's appearance looks festive enough— ribbons or wreaths on the head; possibly straw baskets of flowers.
If you're having your little girls dresses made here are some things you need to know about fabrics, particularly fabrics flattering on children. If you use silks, use medium-weight ones like dupioni or shantung. These will work for winter weddings too, provided you pick a style with long sleeves, jackets, etc. Heavier satins and brocades are out—too weighty for a child to carry off and be comfortable in all day. Instead try lightweight velvets in deep jewel tones for those Christmas/Winter weddings. For spring/ summer dresses, lightweight fabrics like organza, chiffon, and tulle can overlay medium weight silks like those mentioned above. Linen is great for casual and beach weddings.
Most of all, find fabrics and props that encourage them to be kids and have fun. Children after all represent renewal and fertility. What more could you ask on your wedding day?