Names of these could be off but:
Oschon Rose Capeline (hat)
Peach Choker (necklace) (Holiday gear)
Tiki Leaf Lei (top)
Blue Summer Maro (bottom)
Lord's Clogs (shoes) (Holiday gear

All holiday gear is no longer obtainable if you didn't do the event it was in, unless they are in the cash shop. As for the rest they are obtained via desynthesizing certain fish.