DISCLAIMER
Please do not comment stuff like "we all know this". It's a tutorial for intermediate map developers, not for professionals
Eric Gurt updated the editor with many useful trigger actions, including those, that will be explained in this post.
We will focus on FIVE types of action:
Change [...] model of Character 'A' to model 'B' - Let's you swap a part of a body with the part of the other skin. Example:
I just swapped Civil Security Lite's head with Noir Lime head; Lite's body, with Heavy's body.
Set character 'A' color pattern. - Allows you to change each part of body's color to the other one.
HEX Colors doesn't work for this one; you need to use color codes located in official color pattern manual in here: http://www.plazmaburst2.com/level_editor_manual/color%20pattern.html
Now, to make the example above better, i will apply color pattern "dddk" to the character. Outcome:
As you can see, the outcome character looks like a soldier with a gas-mask and a bulletproof vest.
I hope this small tutorial solved your troubles.
There may be grammar mistakes; it's because that i'm still learning english.