These type of overlapping coats has been seen in viking graves at Birka and all across scandinavia. It's also pictured on viking age picture stones. The most likely inspiration for this garment is the Bysantine or russian travels. It's a fashion for the noble viking. The coat can be closed by using ringclasps or with your belt. Is commonly worn with viking puffpants.

Viking coats

Viking coat in wool
Viking coat in wool
790 kr
Viking coat in green wool
Viking coat in green wool
790 kr
Vikingatida rock
Vikingatida rock
790 kr
Viking coat in burgundy wool
Viking coat in burgundy wool
790 kr