Darker colours tend to make people look slimmer. Many people nowadays like to wear loose but well-fitting tunic shirts to create this effect.
Compression capris can make you look thinner. They also help hide trouble areas.
I believe you meant 'does wearing black make you look thinner'...the answer is yes. The opposite is true if you wear white.
They make clothes
Clothes that are quite thin and that will not make you too hot.
One way to make your lips thinner is to have cosmetic surgery. You could also try putting on makeup to try and make them look thinner, such as a lip pencil.
lost cause
Convex mirrors make objects appear smaller and closer than they actually are. This distortion can make you appear slightly thinner when you look at your reflection in a convex mirror.
A long mirrors can work.
Diet Wear Black
The theory is that darker colors make you look thinner. It works for me.
no clothes
You could buy clothes or you can make them. A sewing machine would be fast if you want the clothes to look more professional. You could also make things like shoes out of string, sparkles, foam, and things like that. You could make shirts out of old and decorative socks. This isn't exactly making but you could use other kinds of old doll clothes and use that. Things like that are build a bear and baby doll clothes. You just need to be creative.