Some of them are from the summer event only, and will be back next summer. Some of them are crafted only and are available year round at market prices. Some basic stuff can be purchased from NPCs very cheaply. The Cascadier Voucher was good for the purchase of one free swimsuit from an NPC in Mor Dhona, but the voucher was also only available during the summer event.
The starter AF armor is pretty easy to get - you get four pieces from your level 45 job quest, and the last piece from the level 50 quest. You can then get iLvl 90 relic armor by acquiring "antique" drops from the current Expert level dungeons and trading them in via a mini quest. And because of the glamour system, even if you replaced everything with the latest iLvl 120 Ironworks set, you can continue to look like you're wearing level 45-50 artifact armor if you liked the way it looked. Many white mages continue to do that. (Or, more importantly, you can overwrite some ugly *** armor sets. WTF were they thinking with the BLM/SMN soldiery set? Bleah.)
Edited, Jan 2nd 2015 3:15pm by Catwho