Love the apron dress' simplicity & shape. The dress underneath isn't quite a match for the tribes but the apron dress itself is definitely a good fit for a tribes woman. Scandinavian Apron Dress, Early Medieval period.
Original description: Jorvik Viking Festival 2012 by alh1, via Flickr - I believe she is Saxon, no Viking but such a pretty costume. (My note: I love the embroidery on the cloak. The interwoven circles and the colors. It adds so much extra care and beauty.)