Kiyakotari wrote: »Frostcaster is crown-only, available in the Crown Store for seasonal purchase.
Cavalier of the Sworn Oath is a costume (not a motif or outfit style) that you have to unlock through gameplay.
Colovian Fur Hood (both Filigree and normal) are hats, easily available as "runeboxes" on many guild traders (check on Tamriel Trade Centre website for some that have them listed, if you play on PC/Mac)
Same with Silver Dawn motif (as far as TTC checking goes) but that will be expensive.