I dont remember that one needs to buy FNC's outfit.
I think he means using the tokens you farm and use at the marketplace to buy FNC's outfit. I actually know people who farmed tons of drops in previous events, and forgot to cash in before the last day.
"The girls and I had fought through the most bitter of winters on 4-3E - We were no strangers to the cold... Even now, the blood in my veins chills when I think back to the events of that day... Far, far from home..."