Start by putting on the dress with the waistband under the bust and the straps over the shoulders
TIP: make sure the right strap overlaps the left and give the center edge a tug upwards so that there is no gaping
Bring both straps together and tie in a knot. Then bring these over one shoulder and twist them around each other multiple times to get a roped look at the back. Twist all the way down to the waist.
Finish by tying the straps in a double knot or bow either in the front, back, or side
Then simply make some final adjustments to complete your look!