I cannot recommend this book enough to people interested in either time period. It is well-illustrated and covers many forms of iconography for the time (metalwork, tapestries, etc.). She analyzes the figures and interprets the costume arrangements in them. By far of most interest to me, however, is the last portion of the book that discusses the textile evidence of the period. There are great images of the extant garments as well as pertinent information about them.
I found this book mildly helpful with my Viking research, but it is exceptionally helpful now that I am looking at earlier periods and the transition between the eras.