What you were expecting to happen, and what actually happened:
Witch Armor in the Holiday event is a repeat one, it was already available last year. I was expecting the game to clearly indicate that I already own Witch Armor, not offer it again for purchase. I don’t know what happens when attempting to buy it with enough currency on hand, even if it just tells me at that point that I already own it I’ll have wasted resources on buying event sigils.
That’s a very good point, maybe the event was actually supposed to offer this armor and they put in the wrong one? That would also explain why there isn’t any kind of warning for players who already own Witch Armor.
I can assume that due to numerous bugs in the last update, which had to be urgently corrected, the developers simply did not have time to complete the new armor. That’s why they only offer us last year’s armor instead of new ones.
Well look at that. It’s been found. There is still other armors unless they they are all on other platforms or ones not currently in use. If they did have a new one in mind I’m not sure which one it would be then.
Wait… what? The text is fine, isn’t it? The button should be greyed out if you already own it or something, and it’d be way better if it was a new armour set, but I didn’t think there was an issue with the text.