This book has VERY detailed information on the textiles from the finds (many of which, while not Scandinavian, are still Viking Age). The later part of the book gives detailed analysis of what the costumes of these people might have been like, including drawings for male and female garments. If someone was interested in building out a persona/kit for this time and place, this document is likely the best resource you could hope for. It is pretty amazing.
Oh, and as a side note, if you want hats with "seam embellishments", this area actually has evidence of that practice in the Netherlands on high status items (note though, there are still no sprawling, giant herringbone stitches... this is compact narrow work comparable to Sutton Hoo and Mamman pillows). Just thought I would toss that out there ;-)