Mark one of those strands by making a knot at both ends: this will be the waist band.
Put the waist band around your doll’s waist and tie a ribbon at the back, with a pencil or pen, make a tiny mark on each side of the waistband next to the ribbon, this will let you know where to add your strands.
Undo the waist band and lay it out.
Tie all the other strands by a knot in their middle to the main waist band.
Push the knots together on the waist band so that there aren’t big gaps.
Continue tying strands onto the waist band until there is enough to fill the ear between the marks you made earlier.