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The Thorsberg trousers are dated between the 1st and 4th century AD. The original are diamond patterned brown twill wool.
1st Roman auxiliary soldier and Germanic tribesmen reenactors use this garment for winter reenactments. Roman Legionnaire reenactors stay away from trousers as we know classical writers of the era though of trousers as effeminate and barbaric to wear. I portray a Germanic auxiliary spearman for Legio XIIII during the conflicts in Britannia in 60AD.
Thorsberg was a site that became known for trade in the time frame of "Vikings". It is believed that most men of that era wore tight fitting trousers but with little evidence most reenactors use the Thorsberg trousers as "Viking" trousers.
Here is a scan of page 32 of Die Textilfunde aus dem Hafen von Haithabu; a textile book on finds from Haithabu/Thorsberg:
An images of the preserved fragments reconstructed:
Sew in the gore that makes the crotch. It runs down the top curve of the leg only.
The butt piece runs from F to F going across the bottom of the crotch piece. It should not overlap onto the inner legs
Now sew from D to E a single line.
Set the waist band with the seam to the back.
The belt loops are from a reconstruction drawing I have seen, I cannot say that the original has that triangle shape at the bottom because I have not seen a photo of the inside the original. Either way the triangle shape should go inside the trousers not outside; it is easiest to set them in with the waist band.
Fold the waist band in half and sew down
Roll the edge of the belt loops over the waist band and sew down on the inside of the waist band.
If you desire to attach the feet, I have no information on how the original feet are done. I used a technique used on extent hosen from the late 11th century to the 14th century shown in the Museum of London book Textiles and Clothing.
Simply overlap the seam on the bottom of the foot and whip stitch both inside and outside on the edge. This creates a flat seam instead of a thick traditional seam which is hard to step on.