In Zelda: Echoes of Wisdom, there are a bunch of hidden collectibles you can find, including cute outfits to dress Zelda in with 11 in total to find.
While some of the outfits you can find are purely for cosmetic purposes, a handful of outfits you can obtain have additional effects than just making Zelda look different. Of the 11 outfits, four offer unique bonus effects that either increase hearts, let your spin attack extend, or give Zelda the ability to talk to cute fluffy creatures across Hyrule.