Wiggle refers to a fitted dress characterized by a Hem measurement narrower than at the hips. This style of dress is popular in the 50's and was revived in the 80's too.
The Wiggle is the sexier option for women's dress. The shape of the wiggle skirt is high and tight pleated waist, form fitting through hips, and slightly tapered through the knee.
Wiggle is also known as Wiggle Dress.