Complete the indicated task to unlock the corresponding alternate costume:

Amanda (ritual): Complete the Ghana Time Trial.
Amanda (winter): Complete the Kazhkastan Time Trial.
Biker: Complete England: King Arthur's Tomb.
Biker (no jacket): Collect all Silver and Gold rewards in England.
Biker (red jacket): Collect all Silver rewards in England.
Bikini (black): Complete the game, all Time Trials, and collect all Bronze, Silver, and Gold rewards in all levels, including Croft Manor.
Bikini (white): Complete the game and all Time Trials.
Catsuit: Collect all Gold rewards in Japan.
Classic (gray): Collect all Gold rewards in Ghana.
Classic: Collect all Gold rewards in Peru.
Evening Dress (red): Collect all Silver rewards in Japan.
Evening Dress (ripped): Complete Japan: Meeting With Takamoto.
Goth: Complete the England Time Trial.
Goth (lace shirt): Complete the Japan Time Trial.
Legend (black): Collect all Silver rewards in Croft Manor.
Legend (blue): Collect all Silver rewards in Peru.
Legend (pink): Collect all Silver rewards in Ghana.
Legend (Union Jack): Collect all Silver rewards in Bolivia.
Snowsuit: Collect all Gold rewards in Nepal.
Special Forces (urban): Collect all Gold rewards in England.
Special Forces: Collect all Gold rewards in Kazakhstan.
Sport: Collect all Gold rewards in Bolivia.
Sport (green): Complete the Bolivia Time Trial.
Suit (cream): Collect all Silver and Gold rewards in Croft Manor.
Winter (no coat): Complete Kazakhstan: Project Carbonek.
Winter (no coat, pink): Complete the Peru Time Trial.
Winter (no coat, orange): Collect all Silver rewards in Kazakhstan.
Winter (pink): Complete the Nepal Time Trial.
Winter (orange): Collect all Silver rewards in Nepal.
Winter: Complete Kazakhstan: Project Carbonek.