I sow the idea, and changed a little bit.. and it was great..
I use an L sleeveless shirt, that was from my brother, so it cost nothing to me..
1
Take the sleeveless shirt and draw the line before you cut.
2
cut the shirt.
3
cut in the center of the back, as much as you want to adjust your halter.
4
then cut..
I made 3 cuts..
5
now make some knot bows
6
I make 3 knots bows..
7
and this is how it looks like in the back..