You're not the only one with the problem, that's for sure. I completed 2 of the 4 quests a year ago, but decided I really didn't like snow's outfit so I threw those 2 pieces away and never finished the quests. Now I could only get Lightning's chest and boots if I wanted to finish the quest. I dunno why the Calamity Salvager doesn't just let you re-claim them like the valentine's day event stuff. I guess I won't be bothering with it once again, since whats the point of only getting half of the outfit.