1. A person can put on clothes, etc.
2. A lot of the gear restricted to particular jobs is not gear designed specifically for that/those job(s).
3. Your character is not only one Job/Class.
4. The glamour and gear system does not support Job/Class identity. There are 18 jobs and 11 crafter and gatherer classes, but only 15 glamour plate. Any one item can only have one glamour applied and many jobs/classes end up sharing gear. You cant even have multiples of most high end gear if you wanted to. If you have a glamour that is exclusive to Red Mage when you switch to Black Mage you have the generic look. You can only apply plates in certain areas.
Ok Yda and Papalymo. Iconic characters, specifically identified as a Pugilist and a Thaumaturge. Both wear plate gear.What's wrong with this? It's an NPC, not a player. It's not even an iconic NPC, in fact. This is standard practice in MMOs.