A new pair of publications from the Latvian National Culture Centre: a 2017 wall calendar and a planner with photos of authentic replicas of 7th-14th century garb representing all the chiefdoms of Late Iron Age Latvia. This one is Latgallian (not sure of the century). I'm going to try to get some of these for balticsmith.com.
Terra Celtica, Poland. Iron Age Celtic Garb
The most famous object from Celtic Iron Age Britain | British Museum
Castell Henllys. "The Iron Age Celts' clothes might have looked like the tartan you see in Scotland and Ireland today, with checks and stripes. The Celts used berries and plants to dye the wool different colours."-BBC