Outfits and Headgear are cosmetic only items. You can select 1 out of 4 outfits at the character creation screen. You can obtain outfits by completing some Pursuits, some Missions or purchase them from the game store.
Outfits are the entire appearance from the neck down and Headgear is the head only.
Old Faithful Headgear
Von Bach Gunslinger Cache from VBI faction vendor after completing the Gunslinger DLC missions.
Transferred if owned in Defiance Classic
Omega Recon Outfit
Transferred if owned in Defiance Classic
Omega Recon Headgear
Transferred if owned in Defiance Classic
OT-22R "Obliterator" T.I.T.A.N. Outfit
Obliterator T.I.T.A.N. Bundle
Transferred if owned in Defiance Classic
OT-22R "Obliterator" T.I.T.A.N. Headgear
Obliterator T.I.T.A.N. Bundle
Transferred if owned in Defiance Classic
Paladin Outfit
Von Bach Gunslinger Cache from VBI faction vendor after completing the Gunslinger DLC missions.
Phantom Samurai Outfit
7th Legion Supply Crate from the 7th Legion Faction vendor at Overpass.
Pilgrim of the Guiding Light Outfit
Transferred if owned in Defiance Classic
Pith Helmet Headgear
Heartbreaker Supply Crate or Minor and Major Colony Courtship Arkfalls (Valentine's Event 2014)
Plague Doctor Mask Headgear
Biohazard Lockbox from the Defiance Store
Transferred if owned in Defiance Classic
Plaguesmith Outfit
Chance from Biohazard Lock Box from the Defiance Store.
Transferred if owned in Defiance Classic
Stratotech Defiance 2050 [Source]
3PL9 WDFG DKPR 9LE7 P7Y7 [Redeem]