Garo Gear Exchange.

[Nihility]

Well, just realized the flaw in that plan. Been running my Mnk in PotD on and off all day, and realized that even when I hit 60 I'll still have to rebuy the entire set with WolfMarks since you need to equip the set to get the title, and you need the title to buy the other genders gear for gil cheap and the set I have is for females only. By chance can you find this warning you speak of, I don't remember seeing anything like that.

This just seems like poor planning, both on SE's side and my own.

sounds more like your a fringe case than anything else.
You got the set on a different class than your using it on and changed genders and never got the title that the event told you rebuying them is linked to

18k wolf marks isn't exactly all that much work to get, just go do it and move on

[Zojha]

sounds more like your a fringe case than anything else.

I'd consider it poor planning myself.

It came out in 3.5, so Stormblood was right next door and not planning ahead for RDM and SAM seems rather shortsighted. Neither job can get the buy-back option, because neither has an achievement tied to them and the respective shared gear achievement requires the respective weapon of the other job, so you'd have to grind monk from 0 to 60 to get the buy-back option if you never cared for monk but do care for SAM - that isn't exactly a fringe case either. The alternative is to constantly carry around a set you can't get back nor store in the armoire, 2 if you are unsure whether you'll stick to your gender. I find that needlessly user unfriendly - it's bad enough you can neither stow away nor re-buy cash shop items already, when that could also be solved with achievements like the Garo ones.

The event also doesn't tell you that re-buying them is linked to the title AFAIK. In fact, I don't think I have "ever" been notified when I qualify for buyback via the Salvager or Recompense Officer for any item in any quest or achievement and I don't think the achievements or quests contain a little info text on that either. Feel free to prove me wrong here if you got screenshots of the opposite.

For the OP, the short-term solution is to just grind the items again, but overall, recompense in general could and should be handled a lot better.