[Death by Mirrors]

Here you go:

Laced up in the front (works best with t-shirts that have a slightly loose fit)
Elastic band added in the neckline (works best with non stretchy fabrics)
Top part cut off and replaced with grommets (works best with shirts that are a bit too long, but this is basically two rectangles of fabric sewn at the side with the grommet band on top, so it'd even be easy to make from scratch)