Be honest with yourself, look in the mirror and see which are the most visible problem areas and always keep in mind that you must hide them. For example, if your belly is a problem, wear unics and wrap tops that glide over your stomach. Avoid placing details over your problem area and try to enhance positive features.
These are some of the most important things you should keep in mind if you want to look skinnier. Here are some other trick that you should try:
Wear office style costumes and high heels. It will make you look taller and thinner.