I'm not sure but as far as I remember it was 4000 NCoin gift, in that times around 3b adena.
Bracelet was for free from event, its +10. Necklace I bought during this event for 14b. Ring I bought for dualclass for 120b but for my main class it gives same as trasken. Wings I bought during that event for total around 40b. Belt I farmed myself, by winning ceremony. Brooch as stated above, gift and then upgrade with around 550 jewel gemstones (in that times aquamarines had price 70m). Could you calculate trilion please?
Used knowledge of last update to gather enough circlet scrolls to make around (above mentioned) trilion adena via dawn crystals. Wings see above. Dyes are +5 STR +5 CHA, not new ones. Bought these for 500m each, makes 15b for whole set you can see.
This is basically mid gear. Exalted/+8/+10 normal sets are low, mine is somewhere middle and then there are people who like to buy pixels and got quite different gear (right, @Hyperlite?).
I'm not really sure if majority of players got basic economy knowledge. If even you farm 2b per day, dont expect gears costing 2b. Old players well remember how hard was for example to collect 1000 items from IT just to get random (!) 60% recipe (!) for S grade weapon.