I need to get this here because, despite being outdated, it's still valid and people ignore it's existance (I know I was until that one beauteus thread with a summary of all of the 2.0 promises): Planned systems and content for 2.0, created 10/14/2011

There, it instantes the Mannequin system utilized for 'one touch change of gearset', it also mentions 'gear equipped to mannequins will not take up inventory space' and 'mannequins avaiable increased via quest/battle content'.

That alone should alleviate a LOT of our inventory worries, I do know that I have 80~ inventory slots dedicated to gear alone (i'm a goober though, i'm sure it could be a LOT less). It'll probably be a bit of a strain at first until you get a few extra mannequins but after that, smooth sailing, I think.