Fashion changed throughout the centuries and showed some degree of geographic variation. As a response, we have different kit guides for different date ranges. The primary kit authenticity guide (over 5mb) was published in 2015 (2015 AO Guide) and serves as a great resource for any Viking Age living historian. In 2017 there were some new authenticity rulings published, so make sure to see those changes here: https://regia.org/members/docs/2017newAORulings.pdf
Here are the guides for the various date ranges. Please keep in mind that the River Ravens datelines focus on 793-980 A.D. Make sure to have look at the photo guides as well.