Waist cincher, high-waisted shaping briefs, sculpting panty or shaping bodysuit: pieces that smooth the silhouette under fitted clothing, to be chosen based on the area of effect and the level of compression.
A shapewear works by controlled compression: a fabric with a high elastane content, often reinforced with firmer panels in specific areas, redistributes volume rather than just squeezing it. Two criteria govern the purchase, the area of effect and the level of compression, and they are chosen independently of each other.
The classic shaping brief acts on the abdomen alone, up to the waist: this is the most discreet and wearable version for everyday use, the one sought under the flat stomach shaping brief name. The high waist shaping brief rises under the bust and smooths the upper abdomen, useful under a sheath dress. The shaping panty extends down to the thighs and also addresses the tops of the legs, preventing the demarcation created by a short shapewear. Finally, the shaping bodysuit covers from the bust to the hips in one piece and eliminates any break under a fitted garment.
Light compression smooths the silhouette without being felt: it's for everyday wear and knit clothing. Medium compression visibly reshapes the waist, suitable for an evening out. Strong compression significantly alters the line but becomes uncomfortable after a few hours, thus reserved for events. A common mistake is to make up for insufficient compression by going down a size: this does not provide more support, it causes the shapewear to roll and creates a bulge where one wanted to eliminate it.
Two technical details address the essential. A wide waistband, siliconed on the inside, stays in place where a simple elastic rolls as soon as you sit down. And laser-cut edges, with no hem, leave no line under the garment: this is what makes invisible shapewear. Take your actual size, measured around the hips, not the size you aspire to.