In Orthodox theology the baptismal robe symbolizes the "Garments of Light" (i.e., the fullness of Divine grace) with which Adam and Eve were clothed in the Garden of Eden before the Fall of Man. Baptism is believed to cleanse the believer of all the sinful defilements both of original sin and personal sins and the white garment is symbolic of this. During the ektenia (litany) before baptism, the deacon prays "That he (she) may preserve this (her) baptismal garment and the earnest of the Spirit pure and undefiled unto the dead Early Bright of Christ our God...", referring not so much to the material garment as to the spiritual cleansing it represents.
The Anglican church grew from its mother the Church of England and includes the Episcopal Church in the United States. It views itself as the 'unbroken continuation of the early apostolic and later medieval' "universal church", rather than as a 'new formation'. Manifold of the early traditions are therefore the same as the Roman Catholic and the family heirloom king-size white gown is still used by myriad families. The cutting edge church allows for much diversity, but routinely the clothing is still white for the infant Girls Christening Gowns or young child.