To get new outfits for Krattos, you must first complete the game in
easy, normal or hard difficulty setting, afterwards you will unlock
numerous things in the treasures screen at the main menu. you will
unlock god challenges, you must complete the 10 missions for the god
challenges to unlock new outfits for Krattos, the outfits give different
attributes for him such as this,
Chef of war:
Damage Power 100%
Defense Power 100%
Magic 300%
Health 150%
Experience 100%

Bubbles
Damage Power 50%
Defense Power 100%
Magic 150%
Health 300%
Experience 100%

Tycoonius
Damage Power 200%
Defense Power 400%
Magic 100%
Health 100%
Experience 400%

Dairy Bastard
Damage Power 50%
Defense Power 100%
Magic 200%
Health 200%
Experience 200%
BONUS: Dairy Bastard has infinite magic supply.

Ares Armor
Damage Power 200%
Defense Power 25%
Magic 100%
Health 200%
Experience 200%