Suggestion: Next time they offer something like that, do what I did, and just get one female set and one male set. The vendor for that event had the other set for sale, quite cheap.. about 1k gil each. Sadly, I doubt SE can do anything for you here, as sex change doesn't change sex specific gear over. I did once on an alt, and had to buy the set for the opposite sex. Sometimes you have to think in advance to plan for that very eventuality.