4-5th century tunic idea for a germanic warrior...

[Agraes]

You can also go for a wise choice and keep an undecorated tunic. Both the tunic from Norway and the Thorberg tunic are undecorated: no embroidery, no card woven braids, etc.

Single colored tunics are more and more often depicted on 5th and 6th century iconography. For exemple here on one of the 6th century Ravenna Mosaic:


I think it's a re-enactorism to always go for something decorated. Of course some tunics (apart from so-called coptic fashion of course) may well have been decorated, but they don't necessarly have to be. And picking the right braid with the right material, colors and pattern can be tricky. With only your single colored tunic you know you will be authentic. Status and wealth can be shown through the quality of the weave, the color itself, etc.

If you want something really nice, go for a cloth dyed with natural dyes such as madder or woad, or at least a chemically dyed cloth that has a close color to natural dyes.
You will find some wool like this here: https://www.naturtuche.de/index.php?cat=c36_Wool.html

There was a find dated to the 4th century in Scandanavia (very recent in fact, 2012 at least) of a Tunic with Segmentae (squares) and Clavii (stripes).

There are some Tunics with this kind of ornamentation found in Thorsberg-Mose dating to the 5th/6th century and I think some found in the Netherlands as well.

See here for the Lendbreen tunic (Norway, late 3rd-early 4th century):
http://www.academia.edu/4372500/Out_of_t...lennium_AD

http://www.thehistoryblog.com/wp-content...museum.jpg

And the Thorsberg tunic (3rd century):


I don't see any form of decoration on them