A "ruffle tank" refers to a type of top or blouse that has extra fabric or frills sewn onto the edges, creating a wavy, ruffled appearance. Full definition
I was wearing a white ruffled tank top, floral shorts, and a pair of white sandals. (nicole-aguinaldo.blogspot.ru)
This cardigan dresses up a white crew neck tee for a casual Friday at the office with jeans and looks fabulous with the first white shell from the Banana Republic Factory above or the navy ruffle tank below. (gamineandstripes.com)
Now she pretty much does all her own picking and I knew this pretty little pink ruffle tank and these fun pink metallic slips would be her first pick! (andeelayne.com)