How to make a cinched back tank top

lay shirt out flat

cut seam at bottom

on the sleeves

and in the neckline

it should look a little something like this

for high to low, turn sideways and cut in a downward slope

cut a "V" in the back

gather sleeves, and with extra fabric, tie a knot around it

cut off excess fabric

back view

front veiw

finished product! (: