If you have the PC version of Fallout New Vegas you can probably do it with a console command.
Petro-Chico Jumpsuit 000fd771
Hit the ~ key below the esc key. type player.additem followed by the item code and a value.
For example the jumpsuit would be:
player.additem 000fd771 1
If you wanted 50,000 caps it would be:
player.additem 000000f 50000
Everything in fallout new Vegas has an item code. Most can be found online. However, be aware that using console commands disables the ability to unlock achievements via Steam.
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