it kind of annoys me when it is ALL the time. especially with twins, because i just think they are the same it many other ways they should be able to express themselves differently. there is a family at day care who dress their identical twins exactly the same all the time. they have the same cuddle toy, the same sheets and same pillow case, same bag etc. i think it is probably easier to just buy 2 items when you have twins. maybe that is why they do it. having said that, i usually dress my girls in the same outfit or same outfit different colour when they are in special photos or on special occasions. my older girl really likes it.