How about a loyalty "goldsink" passive ability you can buy, that is just for novelty and allows a person to summon two cosmetic pets instead of one. 2x the loyalty! So relevant!
The invisible armor sets are great, but ...invisible. :/ Maybe an illusion spell (buff) to change your appearance in some way (perhaps into a animal or monster, or even just something that shrinks you in size). Something interesting but ultimately nothing that is going to make the F2P'ers whine about Pay2win.
Love the effects idea for weapons. Also I would enjoy playing a different race VERY much. More novelty heads (of different races) would pacify me just fine in that dept though, and wouldn't require any armor tweaking for different body types.
Also I love modern clothing in fantasy settings (I don't know why but it gives me a giggle), so bring on more modern clothes in the shop! I love the suits, lets see some more trendy sets. How about some fashions you might see a trendy kid wearing on the streets of Harajuku. (Or to bring it closer to Hunted Cow territory: Something you would see in shops on the Multrees Walk).