You will see it’s a men’s cut, so the waist isn’t pinched or tapered too much.
3 Pack Men Body Shaper Slimming Shirts Vest Compression Short Sleeve Shapewear
A nice touch is the adjustable hem with a built-in elastic cord.
Men Slimming Body Shaper Posture Corrector Vest Abdomen Compression Shirt Top
You will find that unisex adult shirts like this are a wardrobe essential.