When I first started doing Viking-era costuming, I focused on the apron dress, and regretfully used my Medieval underdresses pretty much interchangeably. Looking back at them now, I have to flinch a little when I see a large neckline, more suitable for a wide-necked cotehardie, paired with a poorly fitted overdress. I've been doing better, and it's all a learning process, but I thought it was time for me to buckle down and create the most authentic underdress I could with proper color and…