Vivgirl Rio BriefPrima Donna Twist's Vivgirl collection is an instant staple in Black. The combination of sheer black tulle and block black fabric complimented by a wavy motif elevates this everyday collection to something sexy. The rio brief is a mid rise shape in block black fabric complimented by sheer black tulle on the hips. With wavy motif details across the back and down the centre front it gives a smooth line under your clothing. Rio brief. Mid rise style.