We really should be able to glamour other jobs' sets

[Flaws]

For players to wear other job attire means that has to be set to all classes. That will lead to some messy situations. If you ever look at lowbie gear, a lot of people end up wearing the wrong stats. Imagine that in the higher tiers. You're in Dead Ends and someone is wearing all the wrong stats.

It seems to me like you are missing the point. We're not talking about stats or actually putting the gear on as gear on another job, but only being able to glamour it on every other job. Its only about cosmetics, not about letting us equip everything on everything. They should create a new flag (if one isn't already in place) to make items free to glamour on any job even if it isn't wearable as actual gear on those other jobs. In practicality it shouldn't be too complicated from a coding stand point and you don't need to change everything to All Classes as it doesn't actually need to be equippable as gear (with stats), only as appearance.