In Mortal Kombat (aka Mortal Kombat 9, 2011 Version) for the PS3 and Xbox 360, there are a lot of alternate costumes you can purchase in the Krypt from the Extras menu.
In each land of the Krypt, there are numbered markers that you can purchase. Once you purchase them, go to the Nekropolis and click on the corresponding character in order to have access to the costume you purchased. On the character selection screen, you need to press Start in order to change a characters costume once you’ve unlocked them.
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BM5 – Noob Saibot’s Alternate Costume
BM19 – Sindel’s Alternate Costume
BM38 – Kung Lao’s Alternate Costume
BM50 – Jade’s Alternate Costume
BM68 – Ermac’s Alternate Costume
BM82 – Smoke’s Alternate Costume
DL7 – Reptile’s Alternate Costume
DL15 – Johnny Cage’s Alternate Costume
DL28 – Sheeva’s Alternate Costume
DL40 – Baraka’s Alternate Costume
DL47 – Sektor’s Alternate Costume
DL56 – Stryker’s Alternate Costume
DL63 – Quan Chi’s Alternate Costume
DL69 – Kitana’s Alternate Costume
DL88 – Kabal’s Alternate Costume
DL101 – Shang Tsung’s Alternate Costume
DL110 – Nightwolf’s Alternate Costume
DL119 – Scorpion’s Alternate Costume
HI8 – Liu Kang’s Alternate Costume
HI22 – Sonya Blade’s Alternate Costume
HI33 – Mileena’s Alternate Costume
MD6 – Cyrax’s Alternate Costume
MD14 – Raiden’s Alternate Costume
MD25 – Kano’s Alternate Costume
MD36 – Jax’s Alternate Costume
MD54 – Sub-Zero’s Alternate Costume