My experience is based on shirts and…
My experience is based on shirts and tanktops. I wear size medium and the darkpick sizes are fitting well. If you wear M or L in H&M or Jack & Jones its the same in darkpick. Material: when it says cotton it's cotton and it's fine. When it says imitation cotton it's a sort of polyester or polyamid (nylon). You might know it from light sport shirts. This materisl is a matter of taste. I dont sweat in these and I like to wear them as well.