Is there a type of item that looks like this kind of shirt?

Basically very low sides?

There are the muscle tees of course, but the sides don't come down very far.

I also found these, which aren't exactly what you were looking for, but they are interesting midriff-showing wears without just being a simple jacket or crop top. * *come in more colors

Alas, I couldn't find anything with really low sides like you wanted :c

Ohh thank you! Those muscle tees are close enough that they make me happy to see! And the vest is super cool I might use that in an HA too. Thank you so so much <3

You're very welcome~!