This involves changing your save file, so do so at your own risk.

Find your save file, which you can find at C:Documents and SettingsYourNameLocal SettingsApplicationDataXBlades. It should end in .blk, and open it up in a text editor.

Make the alterations below to change your game:

Easy Difficulty:
Difficulty:I=0

Normal Difficulty:
Difficulty:I=1

Hard Difficulty:
Difficulty:I=2

Pro Difficulty:
Difficulty:I=3

Basic Outfit:
GirlModel:I=0

Regenerative Outfit:
GirlModel:I=1

Armored Outfit:
GirlModel:I=2

Money:
Money:I=x (where x can be any number)