Tip #10.
Order kids meal!
Not actual kids. Just their food.
When eating out, you can order an individual pizza or a small sandwich. In this way you keep the calories low and the quantities consumed controlled.
Another trick is to use smaller plates. This helps the portions look larger, and if by looking at them you mind is satisfied, then most likely your stomach will also be satisfied.
Wearing smaller clothes is bad. Using smaller plates is good.