I want to sew a shirt like this but don't know where to start! Sewing Machines Parts and Sales in Los Angeles

Hi all!

I saw a shirt in a music video that I really want to make. The problem is, I don’t know what it’s called and I can’t find any shirts even similar to what it looks like.

Photo #1

Photo #2

I tried searching for things like “shirt with leg straps”, “shirt with buckles”, etc and can’t find anything.

Any help would be greatly appreciated!