You can dye clothing. There's regular dyes which are random, kind of hard to explain how they work, and fixed dyes which dye the color shown on the dye, but are more expensive.
And you can gain or lose wait depending on what you eat. Eating something that would be fattening in real life will fatten you in game. Healthy things, you lose weight. . I reccomend strawberries. Also, no matter what you eat, if you eat when you're not hungry, you'll get fat.