Slimming Pants
There are two main types of slimming pants, one type is simply thick stretched material which holds the abdomen, thighs and bottom in, and moves the fat around to make it "more attractive" with the end result in you simply appearing thinner. Slimming pants of this type do not aid overall weight loss.
The other type of slimming pants are actually very similar although they are generally not designed to alter your appearance, but rather to help increase sweating to aid weight loss. So not the sort of thing you'd wear out and about.
They are made again of a thick stretchy material but have a thin lining on the inside of the slimming pants made of plastic to increase the sweating effect. These work in the same way as non electronic slimming belts.
You can buy slimming pants online or from your local pharmacy.