User blog comment:ACWeapons/How much armor would RWBY characters need?/@comment-25110963-20151211121658/@comment-89.142.250.112-20151211124456

She is a part of the Atlesian military, so if she gets an upgrade/cool armor it would be from them.

TRON stuff because it's cool and futuristic. And she is sort of the most advanced thing on the planet (I guess). Glowy lines make things look cool. Especially experimental super technology. They are green because Penny already has green lines on her boddy, and it's her color.