With little girls, small diadems probably look the best. Since a tiara can have edges that feel hard or sharp for them, the hairband style tiara is the best option. One can also use hairpins and incorporate them along a front braid to give the illusion of a diadem. This is a famous trick for flower girls who need to wear it through the entire wedding without feeling uncomfortable or messing it up. The natural flower tiaras are also a great option and a pretty popular DIY one too.