One kind having different curvatures by different knitting tensions and elastic telescopic power is with a tight waist,In what, the system with a tight waist includes: a circular knitting type main body to its feature,By plural wire rod, annularly sequentially braiding constitutes the circular knitting type tubular body kenel without splicing position for system,The circular knitting type main body system, which defines, to be formed with one and stretches through space； In the reducing diameter part to internal beam miniature state,The what circular knitting type main body centre portion is formed,The reducing diameter part system promotes the elastic telescopic power of circular knitting type main body centre portion using the knitting tension of increase wire rod when braiding,So that the reducing diameter part system is in the undergauge kenel to internal beam contracting； Two wear side,Formed in what circular knitting type main body,Lower two sides,Described low what reducing diameter part of yarn woven tension system for wearing side,Using reduction, this wears the elastic telescopic power of side and constitutes this and wear side with respect to what reducing diameter part system in expanding kenel； And wherein,Wire rod difference knitting tension is utilized with side-line is worn by the reducing diameter part,System is so that have different curvatures and elastic telescopic power under circular knitting type main body what normality unstretched state； Thereby,When the circular knitting type main body covers beam what user's body,So that can reinforce tightening the predetermined position of body by the reducing diameter part,Under in turn can be premised on single product type state with a tight waist,Reach have both it is general just like vest tighten,Slimming effect.一種藉由不同編織張力而具不同曲度及彈性伸縮力之束腰，其特點在於該束腰係包括：一圓編式主體，係由複數線材呈環狀依序編織所構成無拼接部位之圓編式筒狀套體型態，該圓編式主體係界定形成有一穿伸空間；呈向內束縮型態之縮徑部，形成於該圓編式主體中間區段，所述縮徑部係利用編織時增加線材之編織張力而提升圓編式主體中間區段之彈性伸縮力，以使該縮徑部係呈向內束縮之縮徑型態；二穿套側，形成於圓編式
