|hacked shirt in action|
Enter: Your scissors.
For a relatively fitted look, start with a shirt that is just a bit too tight in the chest and a bit too loose in the waist. Like, you could wear it as is but it's just not quite there.
To fix the neckline, lay the shirt flat so that the creases are on the center back and center front and so the shoulder seams line up.
Next: the sleeves. Lay the shirt out flat and get the sleeves in particular nice and flat.
There! That was easy. Being a knit, the t-shirt won't fray - no hemming needed!
Opening up the neckline and the arms helps with the tightness in the chest, and a scoop neckline is flattering on so many body types. For another look, you can start with a large t-shirt and cut a wide neckline and go all layered with a tank underneath. I did that with an 80's-esque T, it's pretty epic.