My recommendation is measure your shoulders. Because you don't want it too tight or too loose. Short sleeve hoodies are better for layers. My FOG SS hoodie felt way better than sitting a LS under it.
I know exactly what you mean, I remember seeing ppl talking about that. Mines black so I was basically just trying to find out for the overall structure of the garment. Years ago I washed a Machus tee that seemed basic and they even told me hand washing was fine to do but it completely mis shaped the whole tee. So this being my first mesh piece from JE I was mainly trying to figure out about the shape and so forth.