This would be a good idea for a men's shirt refashion. Customize the neck opening after cutting the collar off. Leave the sleeve cuffs on, or cut to length, or whatever length you want, or go sleeveless. Nip in the waist with elastic or darts.
How to make a drape t-shirt. A tutorial. (Unfortunately not for this image/shirt, which I love.) Draping tutorial is still good for measurements, but will have to try to figure out this black gray stripe design some other way.