Hair extension attachment

Various embodiments of wefted hair extension attachments include attachment strands extending from the weft base or edge of the attachment. These attachment strands are braided or intertwined directly into the braids formed in the native hair of the wearer as those braids are being formed, without need for additional sewing and thread, adhesives, or other attachment apparatus. The weft base may comprise a relatively narrow, linear weft edge having the hair strands and attachment strands extending in the same direction therefrom, or may comprise a two-dimensional crown sheet having the hair strands extending from a series of wefts from one surface of the sheet and the attachment strands extending from the opposite surface. Each embodiment may include a separator sheet between the hair strands and the attachment strands, to facilitate the manipulation of the attachment strands during installation.