Can either replace the original jacket & polo combo top or be added as a new top depending on how its installed. Now to install it, with the tool of your choice, simply navigate to your playerped archive, optionally rename the ID portion of the names, and drag n' drop the contents of the mod in there.

Depending on if you have Fusion Fix installed, you can find the location for the archive below: 
...\GTAIV\[update]\pc\models\cdimages

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