When the strap of the sling is too long, you can fold it up and down, adjust it to the appropriate length, and then sew the folded position. You can also sew decorations at the position of the interface to cover the sewing trace.
Suspenders are clothes we often wear in summer because they are cool and breathable, but sometimes the suspenders we buy will have long belts, which will affect our wearing experience.
However, the strap of the sling is very easy to transform. We can fold the sling up and down to keep it at the appropriate length, and then sew the folded places together.
Finally, if you feel that this is not beautiful, you can also sew some decorations at their junction to cover up their overlapping position.