You can preview your new custom mesh or recolor texture in a dynamic 3D model viewer that expands to fit your computer screen. You can pick the item you want to replace or recolor by choosing from a thumbnail list that filters by various categories or searches by keyword. You can create your own new hair and accessory meshes for the game and they can have multiple recolor swatches in the same. Using this tool you can make your own custom hair and accessories and you can recolor to your heart's content.
This is a new tool for making custom content for Sims 4.