Armour Documentation Resourses
ManuscriptMiniatures.com is an image collection of miniatures depicting armoured figures from the medieval period. Miniatures are sourced from manuscripts created before 1450 in countries across Europe.
Effigies and Beasses is a site that has compiled detailed pictures from funerary effigies from European countries spanning hundreds of yeatrs. You can do searches based on country, dates, gender and a variety of other criteria.
When you want to start a new harness that will need documentation, this is a great resource to check in with first.
There are a number of great sites that are helpful when documenting your armour