I love creating primitive arts, crafts and dolls which almost always requires some painting. Through trial and error I have found the best fabric to use is cotton. It is durable and the paint absorbs well. Acylic paints work best because they dry much faster than oils and are less expensive too. They come in a variety of colors and you can combine colors to create your own custom colors. You can use the paint full strength but I like to add a bit of water for a smoother application, just dip the brush in the water as you go along. You can also make a nice color wash by using 1 cup water and adding the paint alittle at a time and stiring until you achieve the shade you desire. For a leather like look and feel I use the paint with very little water just enough to maintain a smooth consistency. After it is thoroughly dry I use a fine grit sand paper to give it a smooth time worn finish that really does feel like leather! But be gentle you don't want to rub too vigoriously or your fabric might tear. For fine details use a tiny bristle brush using only the tip and always make sure your paint is wet so it glides on smoothly. Since acrylics do dry quick when exposed to air, only put on your pallette small amounts at a time and if it does dry a bit just add a brush load of water (dip & stir) to moisten it up again. I use a matte  sealer that comes in a spray form (available through craft stores, walmart etc.) when complete to protect the finish. I hope you find this info. helpful!!