From Letter From The Prodcer LIVE Part XXIII:
Q51. A lot of new equipment has been introduced, do you have plans to implement an inventory specifically for glamour, or some type of a gear log?

A51. I understand that players often carry their glamour equipment in the Armoury Chest, and because of this your Armoury is often full. We need to think about the stress being placed on the servers, but would like to somehow increase the quality of life by doing something like adding the ability to glamour from your retainer’s inventory. We’re also looking into saving the glamour status on the client side as a final measure.
Note how the answer doesn't answer the question at all, while implying instead that you should need more retainers. Just when we get the chance to pay for 4 more retainers... Shame on you, SE.
I don't even want this feature to save inventory space (after they announced the new retainers I just turned-in all the green pieces I've been saving since 2.0 launch, except the ones for my main class) but because I would LOVE to have such a log to fill. Please, SE... it's not too late.