This modification adds new t-shirts for Carl Johnson. Similar shirts you may have seen on the Grove Street Gang skins (from the beta version of the game). Each of the t-shirts can be found in Sub-Urban and Pro-Laps.
You can replace them with any t-shirt or shirt/clothes model from CJ's closet. You may modify and upload files at your discretion to other modding sites, but with the original authors or a link to this creation.