You may be mistaken for a costumed hero(ine) of some kind in this purple-on-green GNU Emacs logo t-shirt, modeled here by FSF Program Manager Zoe.

The shirts are manufactured by Bella Canvas, which is WRAP-certified, meaning they comply with ethical, health, and safety standards in manufacturing. Information on their environmental practices is here.

A size chart (in Imperial measurements) for Bella Canvas unisex T-shirts is here.