Dirili had a great way of skipping the tape-pattern method and heat-worry for armor making for your BJD’s, and explains how to make a plaster double as a first step to your armor process!
Making BJD Armor / Making a Body Double for your Doll
Sasara Kusugawa Valkyrie BJD Armor
Worbla works to create armor for smaller scales too – such as ball joint dolls. Archangeli shared how she created the fantastic armor for her Dollfe Dream Sasara Kusugawa that took 2nd place at Anime North’s Doll North Masquerade