If you want to look skinny then try wearing some of the slimming dresses that are on the market. Right now your fashion options are quite versatile when it comes to clothing that can make you look sleeker.
The first thing you need to do is take a good hard look at your figure and decide which body parts are your best features and what features you would like to hide a bit. Sometimes it helps to ask a friend what your best features are in order to gain perspective about what others might be looking at. For instance you might look better at the back then you think. A woman with a pot belly might have a really beautiful rear. A woman with less attractive legs might have beautiful shoulders that should be shown off in a strapless gown.
The first slimming idea is the A line dress. This type of dress has a full skirt with a fitted top. This is a better shape than a baggy dress which contrary to what you believe can actually make your figure look fatter. This is because a billowy dress can cling to less attractive figure features such as fatty hips.
An empire waist which features a skirt that drops from below the bust line is also very slimming. These draw attention to this slim area and provide good coverage of your hips and stomach. For evening a strapless dress with an A-line bottom is very flattering unless your arms are not that attractive.
You can also choose a fitted vest or jacket with an A-line or full dress. This is very flattering and slimming. This works even if you are quite heavy all over.
The seventies style that is back is also great for slimming particularly if you hare top heavy. Dresses with a loose blousy top provide slimming look. The peasant look is also quite slimming as well. Peasant clothing works best if you keep the tops baggier and looser than the bottoms which should be tighter and more fitted. On some figures a tight top looks best with a long flowing peasant skirt.
If you have beautiful legs you can show them off with a mini dress. If you have nice breasts then you can wear a lower cut top to show off your cleavage. This helps refocus attention from your less attractive feature to your more beguiling ones.